What is the hardest language in whole world?

There is no single hardest language in the whole world, as different languages present different challenges and difficulties depending on a variety of factors such as the learner's native language, their learning style, and their motivation. However, some languages are generally considered to be more difficult for English speakers to learn than others. These include:

* Mandarin Chinese: Mandarin Chinese is a tonal language, meaning that the pitch of a syllable can change its meaning. It also has a complex writing system that uses characters rather than letters.

* Japanese: Japanese is another tonal language, and also uses a complex writing system that combines characters and phonetic symbols.

* Arabic: Arabic is written from right to left and has a complex grammatical structure, with many different verb forms and noun declensions.

* Korean: Korean has a complex grammar and a unique writing system called Hangul.

* Russian: Russian has a complex case system, with six different cases that change the endings of nouns, adjectives, and verbs. It also has a challenging pronunciation, with many consonant clusters and sounds that are not found in English.

Of course, any language can be learned with enough time and effort. The key is to find a language that you are interested in and that you are motivated to learn.