A class of words that behaves mostly like verbs (but uses different grammatical endings) and is used to describe properties of nouns. i-adjectives can serve as the predicate of a subject in the main clause (e.g. 空は青い The sky is blue), and can describe any noun by being attached to it as a relative clause (青い空 sky which is blue or simply blue sky).
The name i-adjectives comes from the fact that all members of this class end with the letter い in their dictionary form.
- na-adjectives is separate class of word that are also used to describe properties of nouns, but behave like nouns and not like verbs.
- adjectives is sometimes used to refer to both na-adjectives and i-adjectives together. These two class are utterly unrelated in Japanese, but they both translate to English adjectives, which makes it necessary for learners to treat them together.