IndiaSphere

Japanese has two main classes of adjectives.
Pure adjectives (形容詞 keiyōshi, aka. i-type adjective)
these are very similar to verbs, having roots and conjugating stem forms.
Adjectival nouns (形容動詞 keiyōdōshi, aka na-type adjective)
these are grammatical nouns (though not necessarily legally possible as nouns) that are affixed with -na or -no to form the adjective.