What is the hardest language to learn? A native English speaker and a native Japanese speaker will have very different experiences tackling the same language. Because difficulty is measured by the distance between your mother tongue and the target language.
This guide reveals the 10 hardest languages to learn, breaking down what makes each one so challenging and how long it realistically takes to reach proficiency.
What Is the Hardest Language to Learn in the World?
Based on data from the U.S. Foreign Service Institute (FSI), the following languages require the most study hours to reach professional working proficiency. Each presents a distinct set of challenges.
1. Mandarin Chinese
Mandarin is widely cited as the hardest language to learn for English speakers. It combines three major challenges at once:
- A logographic writing system with over 3,500 characters required for basic literacy
- Four tones that change a word’s meaning entirely depending on pitch
- Grammar structures that work differently from any European language
2. Arabic
When discussing what is the hardest language to learn, Arabic often ranks in second place. Arabic presents a different set of obstacles. The script is written right to left, most vowels are omitted in standard written text. This language also has 28 letters that each take different forms depending on where they appear in a word.
Beyond the script, Modern Standard Arabic (the written form) differs significantly from spoken dialects. This means you may learn to read Arabic fluently while still struggling to understand a conversation in Cairo or Casablanca.
3. Japanese
When discussing what is the most hardest language to learn, Japanese stands out for its complexity. It uses three writing systems at once: hiragana, katakana, and kanji.
Hiragana and katakana are phonetic scripts with 46 characters each. While kanji consists of thousands of Chinese-derived characters, about 2,000 are commonly used by adults. A single sentence can include all three.
Grammar also differs greatly from English, with verbs placed at the end. On top of that, honorific speech (keigo) changes depending on social context, making communication more nuanced.
The FSI estimates it takes about 2,200 hours to reach proficiency.
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4. Korean
Korean is grouped just below the top tier by the FSI at 2,200 hours, alongside Japanese, Mandarin, and Arabic. Although, its writing system, Hangul, is actually one of the most logical and learnable scripts in the world. Most beginners can read it within a week.
What makes Korean difficult is its grammar:
- Verb conjugations are highly complex
- Sentence structure is subject-object-verb (opposite of English)
- An extensive honorific system changes verb endings based on the social relationship between speaker and listener.
5. Cantonese
Cantonese ranks fifth when people ask what is the hardest language to learn. Cantonese is distinct from Mandarin despite sharing the same writing system. It has six to nine tones depending on the dialect region (more than Mandarin’s four), making tonal accuracy even harder to achieve.
Cantonese is the primary language of Hong Kong and many Cantonese diaspora communities, but because it lacks a standardized romanization system as widely adopted as Mandarin’s Pinyin, finding consistent learning resources is more difficult.
6. Polish
Polish is considered one of the hardest language learning challenges in the Indo-European family. While it uses the Latin alphabet, Polish has seven grammatical cases. This means nouns, pronouns, and adjectives change their endings depending on their function in the sentence.
7. Finnish
What is the hardest language to learn for English? Finnish has 15 grammatical cases, no future tense, and virtually no shared vocabulary with English or other major European languages.
Unlike Polish, Finnish grammar has consistent rules without many exceptions. However, the sheer number of cases and the agglutinative structure make sentences very long and complex. The FSI places Finnish at 1,100 hours for English speakers.
8. Hungarian
Hungarian comes in eighth when people ask what is the hardest language to learn.
Hungarian has 26 grammatical cases, more than almost any language in Europe, and uses vowel harmony. This is a system where the vowels in a word must all belong to the same class (front or back).
9. Georgian
Georgian uses its own unique script, Mkhedruli, which bears no resemblance to Latin, Cyrillic, or Arabic characters.
Its grammar includes a complex verb system where the subject, object, and indirect object are all marked within the verb form itself. A single verb can convey what requires an entire English sentence.
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10. Icelandic
Icelandic takes the final spot at number ten when someone wonder what is the hardest language to learn. Icelandic has changed very little since the medieval period, meaning modern Icelanders can still read 13th-century texts with relative ease.
For learners, this means encountering a language with four grammatical cases and three genders. It also involves complex verb conjugations and a vowel system with subtle distinctions that are difficult to hear and reproduce accurately.
How Long Does It Take to Learn the Hardest Languages?
To better understand what is the hardest language to learn, let’s take a closer look at how long it typically takes to learn each language. Learning timelines depend on your native language, study intensity, and immersion opportunities.
The FSI Language Difficulty Rankings divide languages into four categories based on how long they take English speakers to reach professional working proficiency (roughly B2 to C1 level):
- Category I (600-750 hours) – languages closely related to English: Spanish, French, Italian, Portuguese, Dutch.
- Category II (900 hours) – languages with notable differences: German, Indonesian, Malay, Swahili.
- Category III (1,100 hours) – languages with significant differences: Polish, Finnish, Hungarian, Hebrew, Russian, Thai, Vietnamese.
- Category IV / Super-hard (2,200 hours) – languages that are exceptionally difficult for English speakers: Arabic, Cantonese, Mandarin, Japanese, Korean.
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5 Tips for Learning Even the Hardest Languages
If you’re still wondering what is the hardest language to learn, these 5 tips will help make even the toughest languages more manageable. A few strategies make a meaningful difference:
- Start with the script: Before anything else, learn to read the writing system. Trying to learn vocabulary and grammar while relying on romanization creates a ceiling that is hard to break through later.
- Focus on high-frequency vocabulary first: The most common 1,000 to 2,000 words cover the majority of everyday speech in any language.
- Get a native speaker involved early: A tutor or language exchange partner catches errors before they become habits.
- Immerse daily, even in small doses: 30 minutes of listening to podcasts, watching shows, or reading simple texts in the target language beats three hours of study once a week for retention.
- Accept a long timeline: Category IV languages genuinely take years of consistent effort. Setting realistic milestones (read a children’s book, hold a five-minute conversation) keeps motivation higher than measuring against full fluency.
FAQs
What Is the Hardest Language to Learn for Spanish Speakers?
For Spanish speakers, some of the hardest languages to learn are Mandarin Chinese, Arabic, Japanese, and Russian. These languages are challenging because they use different writing systems, grammar structures, and pronunciation patterns compared to Spanish.
Is Mandarin Really the Hardest Language to Learn in the World?
Yes, Mandarin is consistently ranked among the hardest languages to learn for English speakers. Whether it is the single hardest depends on the learner. For most English speakers with no exposure to tonal languages or logographic scripts, Mandarin represents a genuinely steep learning curve that earns its reputation.
What Language Is the Hardest to Learn for English Speakers?
The hardest languages to learn for English speakers, according to the FSI, are Mandarin Chinese, Arabic, Japanese, Korean, and Cantonese. All rated at 2,200 class hours. Among these, Mandarin and Japanese are the most commonly cited at the top of difficulty lists.
What Is the 20 Hardest Language in the World?
Beyond the top 10, several languages consistently rank as difficult for English speakers, including Thai, Vietnamese, Mandarin Chinese, Cantonese, Japanese, Korean, Arabic, Hebrew, Czech, Slovak, Croatian, Polish, Hungarian, Finnish, Estonian, Turkish, Uzbek, Kazakh, Chechen, and Abkhaz.
Final Thoughts
What is the hardest language to learn depends on the learner, so there is no single answer. For English speakers, however, Mandarin, Arabic, Japanese, and Korean consistently rank among the hardest. This is due to their writing systems, tonal or honorific complexity, and significant grammatical differences from European languages.
