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English
Adverb (fukushi)
Adverb taking the 'to' particle
Onomatopoeic or mimetic word
soundly (sleeping), fast (asleep)

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Phrases
昨夜はぐっすり眠れなかった。
Parts: 昨夜 (ゆうべ) ぐっすり (グッスリ) 眠る (ねむる)
I couldn't sleep well last night.