How to say "completely" in Japanese

• すっかりJLPT N4approx.Common
  adverb (with と)Covers "completely" for a state that has become wholly so — you have completely forgotten something, or a room has gone completely quiet. Mimetic in flavor, it stresses the finished, total state.
  私はすっかり息いきが切きれた。↗

  I am completely out of breath.
• 一向いっこうCommon
  adverbFor plain "completely" this is seldom the word you want: it really means "not at all, not in the least," used in negative or dismissive statements such as "I don't mind in the least."
• 散々さんざんCommon
  na-adjective, adverbCovers "completely/utterly" when something is done or endured to the full, usually unpleasantly — being kept waiting for ages, or getting a thorough scolding. It carries a sense of "to one's cost or annoyance."
• すっぽりCommon
  adverb (with と)A mimetic adverb for something fitting or slipping entirely inside or under something else, with no part left showing — the "completely" of a thing vanishing wholly into a space.
  町まちが一面いちめんすっぽり雪ゆきをかぶった。↗

  Snow completely covered the town.
• まったくJLPT N3approx.Common
  adverb, no-adjectiveThe all-purpose intensifier: "completely" with an extreme or changed state ("completely different," "completely unable to understand"), and "really, truly" when simply strengthening what you say. Usually the safest choice for plain "completely."
  彼かれの意見いけんは我々われわれの意見いけんとはまったく違ちがっている。↗

  His opinion is quite different from ours.

Use 「まったく」 as the all-purpose intensifier, 「すっかり」 for a state that has become wholly so, 「すっぽり」 for things fitting entirely inside something, 散々 for doing something to the full, and 一向 only in negative "not at all" phrases.

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

• すっかりall
• 一向いっこうcompletely
• 散々さんざんthoroughly
• すっぽりentirely
• まったくreally
• 一向にいっこうにcompletely
• まるっきりcompletely
• 残らずのこらずall
• そっくりall
• つくづくdeeply
• まるきりcompletely
• ただただabsolutely
• ごっそりcompletely
• とんとcompletely
• すっぱりcompletely (quitting, etc.)
• こてんぱんcompletely (beaten, defeated, etc.)
• けろけろcompletely
• ごそっとcompletely
• けろりcompletely
• けろっとcompletely
• とっぷりcompletely
• もろにcompletely
• 完膚なきまでかんぷなきまでcompletely
• 万ばんcompletely
• ずぶcompletely
• すぱっとcompletely (quitting, etc.)
• こてんこてんcompletely (beaten, defeated, etc.)
• まるっきしcompletely
• ずくめentirely
• てんで(not) at all
• つぶさにin detail
• 無下むげwithout a doubt
• さんざっぱらthoroughly
• 杳としてようとしてutterly (unknown; esp. of someone's whereabouts)
• 諸手を挙げてもろてをあげてwholeheartedly (approve, agree, etc.)
• 一味も二味もひとあじもふたあじもtotally (different)
• きれいさっぱりonce and for all
• 端から端まではしからはしまでfrom one end to another
• さんざんぱらthoroughly
• 残さずのこさずall
• フルにfully
• １００パーひゃくパー100 percent
• まんまとsuccessfully
• 洗いざらいあらいざらいall
• ほとほとquite
• からっきしquite
• まったくもってas a matter of fact
• 無下にむげにbluntly (refusing, etc.)
• 遺憾なくいかんなくfully
• かいくれ(not) at all
• きれいcompletely
• 全然ぜんぜんwholly
• すべてentirely
• およそcompletely
• まるでreally
• 丸々まるまるentirely
• しっかりproperly
• ばっちりenough
• おおよそcompletely
• くるりcompletely (wrapped in something)
• もろcompletely
• 根こそぎねこそぎall (destroyed, stolen, etc.)
• ぷっつり(stopping) suddenly (of communications, a practice, etc.)
• ぞっこんfrom the heart
• すっくりall
• 頭からあたまからentirely
• とことんto the very end
• ばっさりdrastically (slash a budget, etc.)
• ばっちしenough
• がらり(changing) completely
• ガラッと(changing) completely
• すっきりcompletely
• さっぱりcompletely
• からりcompletely (forget, change, etc.)
• はたとcompletely
• ぐっとcompletely (e.g. at a loss)
• ころっとcompletely (e.g. forgetting)
• ぺろり(peeling off) in one go
• ぺろっと(peeling off) in one go
• 入るいるto (reach a state) completely
• 去るさるto (do) completely