|sci.lang.japan FAQ / 2. Grammar / 2.4. Other grammar questions|
I adjectives are a form of adjective like atsui (熱い), "hot", or akai (赤い), "red" which end in an "i" syllable (い), and can change to negative forms by adding kunai. For example atsukunai, "it's not hot", or akakunai "it's not red". They also have past tenses, like atsukatta, "it was hot", or akakatta, "it was red". They can also become adverbs, atsuku moeru "burn hotly". Like Japanese verbs, the i adjectives can go at the end of sentences: Kyō wa atsui "It's hot today."
The following table demonstrates some i adjectives.
|akai||赤い あかい||red||akai kuruma "A red car"||akakunai neko "A cat which is not red"|
|kowai||怖い こわい||scary||kowai eiga "A scary movie"||kowakunai inu "A dog which is not scary"|
|muzukashii||難しい むずかしい||difficult||muzukashii mondai "A difficult problem"||muzukashikunai shigoto "Work which is not difficult"|
|atarashii||新しい あたらしい||new||atarashii zubon "New trousers"||atarashikunai pasokon "A computer which is not new"|
|furui||古い ふるい||old||furui tatemono "An old building"||furukunai tokei "A clock which is not old"|
|kawaii||可愛い かわいい||cute||kawaii akachan "A cute baby"||kawaikunai neko "A cat which is not cute"|
All i adjectives end in ai, ii, ui or oi. There are none ending in ei.
Not every word ending in i is an i adjective. For example, the word kirai is an adjective, but the final "i" does not conjugate. Instead it takes na. For example, "food (I) dislike", is kirai na tabemono and "food I do not dislike" is kirai ja nai tabemono, with the final "i" not changing.
The other main kind of adjective is the "na" adjective such as kirai above. A few words come in both i adjective and na adjective forms, such as ōkii ("big") and ōki na ("big"). See 2.4.3. What is the difference between ōkii and ōki na?
Many adjectives related to human emotions are i adjectives which end in shii, for example tanoshii (楽しい), "enjoyable", kanashii (悲しい), "sad", or muzukashii (難しい), "difficult".
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