Noun, Suru verb
limpness
帽子がぬれてふにゃふにゃになった。The hat got wet and went limp. Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'
soft; limp; flabby
mumbling; talking with food in one's mouth
sometimes instead of むにゃむにゃ
Also written フニャフニャ