決め込む・決めこむ・決込む・極め込む|きめこむkimekomu[3]nakadaka (mid-high)
This browser can't play pronunciations (needs Safari 18.4 or later, or Chrome / Edge / Firefox).
Which spelling to use
決め込む決め込む is the most common written form of this expression and the form beginners should use.
決めこむ決めこむ is a less common written variant of 決め込む; you may encounter it, but beginners should normally choose 決め込む.
決込む決込む is less common than 決め込む and 決めこむ, though it represents the same expression; beginners should use 決め込む for writing.
極め込む極め込む is the least common of these four written forms; beginners should use 決め込む instead.
Definitions
- godan verb, transitive verbto take for granted; to assume; to be convinced (that); to jump to the conclusion (that)
- godan verb, transitive verbto pretend (to be); to pose (as); to fancy oneself (to be); to feign (e.g. ignorance)
- godan verb, transitive verbto go through with (what one decided to do); to persist in doing; to make up one's mind
Conjugation
| Dictionary form | 決め込む（きめこむ） |
|---|---|
| Polite (masu) | 決め込みます（きめこみます） |
| Negative (nai) | 決め込まない（きめこまない） |
| polite (masen) | 決め込みません（きめこみません） |
| classical zu / nu | 決め込まず・決め込まぬ（きめこまず・きめこまぬ） |
| Past (ta) | 決め込んだ（きめこんだ） |
| polite (mashita) | 決め込みました（きめこみました） |
| Past negative (nakatta) | 決め込まなかった（きめこまなかった） |
| polite (masen deshita) | 決め込みませんでした（きめこみませんでした） |
| Te form | 決め込んで（きめこんで） |
| Potential | 決め込める（きめこめる） |
| Passive | 決め込まれる（きめこまれる） |
| Causative | 決め込ませる（きめこませる） |
| Causative passive | 決め込ませられる・決め込まされる（きめこませられる・きめこまされる） |
| Conditional (ba) | 決め込めば（きめこめば） |
| tara | 決め込んだら（きめこんだら） |
| Volitional | 決め込もう（きめこもう） |
| polite (mashou) | 決め込みましょう（きめこみましょう） |
| Imperative | 決め込め（きめこめ） |
Common forms generated by rule; see the senses for honorific or irregular usage.
Synonyms & antonyms
- SynonymみなすWrittenWritten: to regard or treat something as such; in legal texts, to deem. 「決め込む」 adds a willful, subjective flavor.
- Synonym思いなすおもいなすWrittenWritten word for being convinced something is true; rarely used. 「決め込む」 stresses deciding on your own authority or putting on an act.
- Related推測すいそくWrittenGuessing from clues, fairly objective. 「決め込む」 is deciding something and insisting on it.
- Related推量すいりょうWrittenWritten conjecture; also a grammar term. It lacks the nuance of deciding something arbitrarily.
- Related忖度そんたくWrittenWritten: surmising what others feel; in recent usage often currying favor with a superior. Different in kind from 「決め込む」.
- Related思うおもうNeutralThe most general verb for thinking or feeling. 「決め込む」 carries the sense of concluding on your own or deliberately acting as if.
- Related推定すいていWrittenPresuming from circumstances; often legal and fairly objective. 「決め込む」 is subjective and willful.
- Related想定そうていWrittenAssuming or envisioning a situation in advance, as in 「想定外」. It is about presetting a scenario.
- Related仮定かていWrittenTentative assumption, as in 「仮定の話」. It sets something up provisionally, with no willful coloring.
- Related憶測おくそくWrittenSpeculating on uncertain grounds, as in 「憶測を呼ぶ」. It stresses loose, ill-founded guessing rather than reasoning from solid clues.
- Related考えるかんがえるNeutralThe most general verb for thinking things over. 「決め込む」 stresses holding firm once you have decided.
- RelatedにらむCasualColloquial: to glare at someone, but also to size up or suspect, as in 「犯人だと睨む」. It carries a tinge of suspicion.
- Related想像そうぞうNeutralImagining, forming pictures in your mind. 「決め込む」 stresses subjective conviction.
- Related推察すいさつWrittenWritten: inferring feelings or circumstances, as in 「事情を推察する」; common in the honorific 「ご推察」. It stresses perceptive reading of a situation, not willful conviction.
- Related推論すいろんWrittenWritten: logical inference, as in 「推論を立てる」. Rigorous reasoning, not a snap decision.
- Related臆度おくたくWrittenWritten: groundless speculation; very rare. It is about guessing, not putting on a pose.
- Related憶断おくだんWrittenWritten: jumping to a conclusion from conjecture. Close to the arbitrary conviction of 「決め込む」.
- Related措定そていFormalFormal philosophical term for positing something. Far removed from everyday 「決め込む」.
- AntonymためらうCasualColloquial: to hesitate or waver. The opposite of the resolute conviction of 「決め込む」.
- Antonym迷うまようNeutralTo be unable to make up your mind. The opposite of 「決め込む」's flat, unshakable assertion.
To simply think or believe, say 「思う」. 「決め込む」 is for settling on something on your own and sticking to it, or deliberately posing, as in 「知らん顔を決め込む」 and 「居留守を決め込む」. To hesitate, say 「迷う」.
Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only
Japanese definitions
Kanji in this word
English equivalents
See also
