What Is the Hardest Language to Learn?

There's no single "hardest language" for everyone — it depends heavily on your native language. But for English speakers, a few languages are consistently ranked the most difficult.

The hardest languages for English speakers: The U.S. Foreign Service Institute (FSI), which trains diplomats, ranks languages by how long they take to learn. Its hardest category ("Category IV / Super-hard," around 2,200 class hours) includes:

• Mandarin Chinese — often cited as the single hardest, due to thousands of characters, tones, and a writing system unrelated to the alphabet.
• Cantonese — even more tones than Mandarin.
• Japanese — three writing systems (hiragana, katakana, kanji) and complex politeness levels.
• Korean — unfamiliar grammar and sentence structure (though its alphabet, Hangul, is actually easy).
• Arabic — a different script, right-to-left writing, sounds not found in English, and many regional dialects.

What makes a language hard to learn?

• A different writing system (characters or a new script vs. the Latin alphabet).
• Tones, where pitch changes a word's meaning (Chinese, Vietnamese, Thai).
• Grammar that's very different from your own (cases, word order, honorifics).
• Sounds that don't exist in your native language.
• Fewer cognates (shared/similar words) with your language.

The key point: "Hardest" is relative. Mandarin is brutal for an English speaker but easier for a Cantonese speaker. For English speakers, the easiest languages are close relatives like Spanish, French, and Dutch, while Mandarin, Arabic, Japanese, and Korean are the toughest.