There is no single language considered the hardest for everyone. The ease or difficulty largely depends on how different the new language is from the learner's native language. For instance, a language that seems extraordinarily difficult for English speakers might be easier for someone whose native tongue shares similarities in script, sentence structure, or vocabulary.
However, classifications by the U.S. Foreign Service Institute offer a practical gauge of a language's difficulty for English speakers. The hardest category includes five languages: Mandarin Chinese, Cantonese, Japanese, Korean, and Arabic, with proficiency typically requiring around 2,200 hours of study.
Which Languages Are the Most Difficult to Learn?

1. Mandarin Chinese
Mandarin Chinese is one of the hardest languages for English speakers, mainly due to its writing system and pronunciation. Instead of a traditional alphabet, it uses thousands of characters, and tone can change a word's meaning. Learners must simultaneously develop the skill to pronounce tones correctly and memorize a large number of characters.
It's classified as one of the most difficult languages, requiring approximately 2,200 hours of study to reach a professional level.
2. Japanese
Japanese combines several writing systems, making reading and writing highly challenging for beginners. Its sentence structure differs significantly from English, and the language uses multiple levels of politeness and formality, which means selecting the appropriate form can depend on the relationship between speakers and the context of the conversation.
According to Foreign Service Institute data, it falls into the hardest category, needing about 2,200 hours of study for English speakers.

3. Korean
Korean features its own writing system and significantly different grammar compared to English. It uses a sentence order distinct from typical English structure, along with particles and various levels of speech and respect. Verb conjugation and adding suffixes to words require consistent practice with a different sentence construction style.
Hence, Korean is considered one of the most challenging languages for English speakers, requiring around 2,200 study hours according to the Foreign Service Institute.
4. Arabic
Arabic might be less alien to those familiar with other languages but poses a significant challenge to English speakers due to its script, grammar, and sounds. The difficulty is compounded by the distinct difference between Classical Arabic and the various dialects used daily. Students may learn standard Arabic rules and reading but need to acquire the local dialect to communicate effectively.
Moreover, Arabic employs a derivational system based on roots and patterns, with multiple verb and noun conjugations. These factors place it in the hardest group according to Foreign Service Institute classifications, needing about 2,200 hours of study for English speakers.
5. Cantonese
Cantonese is challenging due to its complex tonal system, where tone changes can alter a word's meaning, and its writing system presents an additional hurdle for those unfamiliar with Chinese characters. The spoken Cantonese differs substantially in pronunciation from Mandarin.
Thus, alongside Mandarin, Japanese, Korean, and Arabic, it ranks among the hardest languages in classifications for English speakers).

6. Hungarian
Hungarian vastly differs from more common European languages, featuring numerous cases and its agglutinative structure, where word endings are modified with suffixes. Learners must memorize many rules about word formation and endings, and the vocabulary might seem unfamiliar to English speakers.
It's generally categorized among the difficult languages, requiring about 1,100 hours of study as per Foreign Service Institute data.
7. Finnish
Finnish has a complex grammatical system with numerous cases, as well as distinct rules for vowel harmony and word construction. Learners tackle expressing relationships between words differently and encounter vocabulary that is largely unfamiliar to English speakers.
The Foreign Service Institute estimates about 1,100 hours of study for English speakers to learn Finnish.
8. Polish
Polish features complex inflectional rules and several grammatical cases, plus clusters of consonants that pose pronunciation challenges for beginners. The language demands attention to grammatical gender and word concord, increasing the number of rules learners need to master.
It's listed among languages that require about 1,100 hours of study for English speakers according to Foreign Service Institute classifications.
9. Russian
Russian combines a different script than the Latin alphabet with grammar requiring time to master. It uses multiple cases, and its verb system features different aspects, making the expression of an action's completion or duration a critical part of the language.
The time required to achieve proficiency is estimated at around 1,100 hours for English speakers, based on Foreign Service Institute classifications.

10. Icelandic
Icelandic retains many ancient grammatical and inflectional features, making it more complex for learners from different linguistic backgrounds. It involves dealing with noun, adjective, and verb declensions, as well as unfamiliar vocabulary and phonetics for English speakers.
It falls under the category of difficult languages, with approximately 1,100 hours of study needed according to Foreign Service Institute data.
What Makes a Language Difficult to Learn?
Several factors contribute to the difficulty of learning a language, not just the number of grammatical rules.
Main Difficulty Factors
Writing system difference: As seen with Chinese characters and Japanese systems.
Tonal languages: Like Mandarin and Cantonese.
Complex grammar: Especially when radically different from the learner's native language.
Word inflection: Some languages change word forms based on their sentence position.
Speech levels: Prominent in Japanese and Korean.
Difference between written and spoken forms: A significant challenge in Arabic.
Lack of vocabulary similarity: The more distant words are from the native language, the more vocabulary must be memorized.
Is Arabic Among the World's Toughest Languages?
Yes, but this can depend on the learner's background. Arabic is one of the hardest for English speakers according to the Foreign Service Institute, alongside Chinese, Japanese, Korean, and Cantonese.
For native Arabic speakers, the scenario differs entirely; some Semitic languages may appear easier due to similarities in vocabulary or structure, while East Asian languages could present more challenges due to differing writing, pronunciation, and sentence structure.
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