すっかりsukkari

1. adverb (with と)all; completely; totally; entirely; thoroughly
   私はすっかり息いきが切きれた。↗

   I am completely out of breath.

• SynonymまったくNeutralAlso means 'completely', but more often takes a negative for 'not at all', as in 「全く知らない」; also an exclamation. For a full change of state, 「すっかり」 is usual.
• SynonymまるっきりCasualMostly with a negative for 'not at all', as in 「まるっきり分からない」; in affirmatives too, as in 「まるっきり忘れていた」. More colloquial than 「すっかり」.
• Synonym全然ぜんぜんNeutralUsually with a negative for 'not at all', though colloquially also 「全然変わった」. With a negative, 「すっかり」 mostly means 'has fully become so', as in 「すっかり見かけなくなった」.
• Synonym一切いっさいNeutralCovers 'all, everything', but mostly takes a negative for 'not in the least', as in 「一切関係ない」, with a forceful tone. Also a noun meaning 'everything'.
• SynonymさっぱりCasualUsually means feeling refreshed or neat; with a negative it means 'not at all', as in 「さっぱり分からない」. In 「さっぱり忘れる」 it is close to 「すっかり」, thorough and clean.
• SynonymまるきりCasualSame meaning as 「丸っきり」: mostly with a negative for 'not at all' or 'completely not'. For describing a complete change of state, 「すっかり」 is the usual word.
• SynonymきれいさっぱりCasualStresses leaving things spotless, nothing left, as in 「きれいさっぱり忘れる」. It highlights total clearing-out more than 「すっかり」, and can also mean 'perfectly clean'.
• Related根っからねっからCasualStresses being that way by nature or at heart, as in 「根っからの悪人」; also takes a negative for 'not at all'. It does not describe completeness after a change of state.
• Related徹底的てっていてきNeutralA na-adjective stressing a thorough method that leaves no gaps, as in 「徹底的に調べる」. 「すっかり」 describes a resulting state that is completely so.
• RelatedすっぽりCasualA mimetic word for something being wholly covered, fitted over, or slipping snugly in or off, as in 「すっぽり覆う」. 「すっかり」 lacks this image of enveloping or fitting.
• Related一向いっこうNeutralUsually as 「一向に～ない」 for 'not in the least', as in 「一向に構わない」 and 「一向に進まない」. For saying something has completely changed, use 「すっかり」.
• Related絶対にぜったいにNeutralMeans 'no matter what, definitely', as in 「絶対に行く」, stressing certainty. 「すっかり」 is about degree or result — how completely something is or has become.
• Related余すところなくあますところなくWrittenWritten/formal: covers everything with nothing left out, often for introducing or showcasing, as in 「魅力を余すところなく伝える」. 「すっかり」 is about a state fully changing.
• RelatedからっきしCasualMostly with a negative for being utterly hopeless, as in 「からっきしダメだ」; strongly colloquial. Not used for a complete change of state.
• Related徹頭徹尾てっとうてつびWrittenWritten/formal four-character idiom for staying consistent from start to finish, as in 「徹頭徹尾反対する」. It stresses holding a stance throughout, not a completed change.
• Related骨の髄までほねのずいまでNeutralIdiom meaning 'to the marrow', for things soaking in deeply or felt keenly, as in 「骨の髄まで染みる」. More vivid and exaggerated than 「すっかり」.
• RelatedずぶCasualColloquial, mostly in fixed phrases like 「ずぶ濡れ」 and 「ずぶの素人」, meaning thoroughgoing. For saying something has fully become a state, 「すっかり」 is the usual word.
• RelatedずっぷりCasualA mimetic word for being fully submerged or soaked through, also figuratively sunk deep into something, as in 「悪の世界にずっぷり浸かる」. 「すっかり」 has no image of immersion.
• Antonym少しすこしNeutralAntonym: means only a small amount or degree, as in 「少し変わった」 — the opposite of the completeness of 「すっかり」.

Default to 「すっかり」 for a complete change of state. With a negative meaning 'not at all', reach for 「全く」 or 「全然」; for forgetting something once and for all, 「きれいさっぱり」; for a thorough method, 「徹底的」; for just a little, 「少し」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. ある状態じょうたいに完全かんぜんになる様子ようす。
2. 残のこるものがないさま。