ふへん 不変 Common word LinksSentence search for 不変Sentence search for ふへんKanji details for 不 and 変Edit in JMdict Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no', Noun1. eternal; everlasting; unchangeable; immutable; immovable; constant; permanent; indestructibleAntonym: 可変Noun2. invariantMathematics Discussions Log in to talk about this word.