There's no single "hardest" grammar, but languages like Finnish, Hungarian, Polish, Basque, Icelandic, Russian, and Arabic are consistently cited as extremely difficult due to extensive case systems (10+), complex word formations (agglutination), and unique structures, while Japanese challenges with particles, implied meaning, and honorifics, and Mandarin Chinese with tones and characters, though grammar itself is relatively simple. The difficulty often depends on your native language.
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I think that your best bet would be French. Basic English vocabulary, including all of the 100 most common words, has its origin in Germanic/West Frisian, but word order is closer to French.
There's no single "hardest" language, but Mandarin Chinese is consistently ranked #1 for English speakers due to its tonal nature (four tones change word meanings) and complex logographic writing system requiring thousands of characters. Other top contenders often cited include Arabic (right-to-left script, complex sounds, grammar) and Japanese (multiple writing systems like Kanji, Hiragana, Katakana, plus honorifics). The difficulty depends heavily on your native language, with languages like Tibetan, Estonian, and Polish also challenging learners with unique grammar or cases.
There's no single "number one" easiest language, as it depends on your native tongue, but for English speakers, Norwegian, Dutch, Afrikaans, Spanish, and Italian are consistently ranked as very easy due to similar Germanic roots (Norwegian, Dutch, Afrikaans) or shared Latin vocabulary (Spanish, Italian) with English, plus simple grammar and pronunciation. The truly easiest language is the one you're most motivated to learn and find engaging content in, as personal interest drives acquisition.
Once you know the alphabet, you can read any Russian word, even if pronouncing it correctly is another challenge. Chinese writing is a different beast. To be literate, you need to know around 3,000 unique characters, each with its own pronunciation and meaning.
Dutch is the closest major language to English
With 22 million native speakers and an additional six million who speak it as a second language, Dutch is the third most widely spoken Germanic language in the world (after English and German).
German grammar is often cited as being particularly difficult. While it's true that German has features such as grammatical cases and gendered nouns, it also has several elements that are similar to English. For instance, both languages use auxiliary verbs and have similar tense structures.
You can also identify your nearest endangered language.
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Dutch, Frisian, and German stand as the nearest kin to English, with Frisian holding the strongest resemblance. The syntax, lexicon, and phonetics of both Frisian and English demonstrate their shared lineage.
To conclude, we can say that 1) Spanish grammar is more complicated to learn than English grammar (if your mother tongue is not a Romance language) and 2) the pronunciation and spelling in English are more complex than in Spanish.
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English grammar CEF level requirements
Mandarin Chinese
Its writing system is character-based, meaning you'll need to memorize thousands of symbols to read or write fluently.
The 80/20 rule (Pareto Principle) applied to learning German means focusing your efforts on the 20% of high-frequency vocabulary, grammar, and phrases that will give you 80% of your understanding and conversational ability, making learning more efficient. Instead of learning everything, prioritize common words, basic sentence structures, and practical phrases for travel or specific goals, allowing for rapid, functional communication and confidence building.
English is a hodge-podge language that pulls from many others, so you'll find cognates (words that sound and look similar in two languages) in both. German wins with the number of similarities, though—it shares over half of its words with English!
Old English (also called Anglo-Saxon) is an early form of the English language which was spoken in England around the year 1000. It is a West Germanic language, and is therefore similar to Frisian and Old Saxon. It is also quite similar to Old Norse (and, by extension, to modern Icelandic).
Here are some pretty similar pairs:
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The 7-letter Russian spelling rule states that after the consonants г, к, х, ж, ч, ш, щ, you never write the vowel Ы, but instead use И, even if the sound is hard (like in жизнь - life). This also applies to other vowels: after these seven letters, never write Ю, use У (e.g., чуть), and never write Я, use А (e.g., часто), a principle often extended to include the letter Ц in broader rules. This rule ensures consistency with phonetic shifts after these specific "hard" or "hissing" consonants, helping learners avoid common mistakes in endings.
The Foreign Service Institute has determined it takes around 1100 hours for native English speakers to reach fluency in Russian. If you spend 60 minutes per day studying Russian, it will take you 3 years.
While both languages can be challenging for English speakers, Mandarin is generally seen as being more difficult. This is due to the fact that there are thousands of Chinese characters, while Arabic only includes 28 letters in its alphabet.