noun which may take the genitive case particle 'no', na-adjective, adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
soft and fluffy; plump; springy
Describes something pleasantly soft, fluffy, and resilient, like a fresh bed, bread, or a thick carpet. Often used with する or as an adverb.
このパンはふかふかでとてもおいしい。
This bread is soft and fluffy and very delicious.
新しい布団はふかふかしている。
The new futon is soft and springy.
adverb taking the 'to' particle, noun or participle which takes 'suru'
Archaic mimetic use for being spaced out or not paying attention. Rare in modern Japanese; the soft/fluffy sense is overwhelmingly more common.
古文では「ふかふかと」がぼんやりした様子を表すことがある。
In classical texts, ふかふかと can describe an absent-minded state.