思おもい立たつ

お

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つ

JLPTN2Freq.FrequencyTop 100,000

思い立つ · godan verb (-tsu)

Form	Positive	Negative
Dictionary	思おもい立たつ	思おもい立たたない
Polite	思おもい立たちます	思おもい立たちません
Past polite	思おもい立たちました	思おもい立たちませんでした
Past	思おもい立たった	思おもい立たたなかった
Te-form	思おもい立たって	思おもい立たたないで
Desire	思おもい立たちたい	思おもい立たちたくない
Potential	思おもい立たてる	思おもい立たてない
Passive	思おもい立たたれる	思おもい立たたれない
Causative	思おもい立たたせる	思おもい立たたせない
Causative passive	思おもい立たたせられるalso 思おもい立たたされる	思おもい立たたせられないalso 思おもい立たたされない
Volitional	思おもい立たとう
Polite volitional	思おもい立たちましょう
Imperative	思おもい立たて	思おもい立たつな
Conditional	思おもい立たてば	思おもい立たたなければ
Tara conditional	思おもい立たったら	思おもい立たたなかったら

Meanings

godan verb (-tsu), transitive verb

make up one's mind; resolve to do; hit upon the idea

Expresses the moment of deciding or getting the idea to do something, often suddenly or on impulse. Commonly used in the set phrase 思い立ったが吉日 (strike while the iron is hot).

彼かれは急きゅうに旅りょ行こうに行いこうと思おもい立たった。
He suddenly made up his mind to go on a trip.
思おもい立たったが吉きち日じつ、今日きょうから勉べん強きょうを始はじめよう。
There's no time like the present; I'll start studying today.

See all 8 example sentences ›

Usage patterns

〈事こと〉を思おもい立たつto suddenly decide to do something
彼かれは一人ひとり旅たびに出でることを思おもい立たった。
He suddenly decided to go on a solo trip.
思おもい立たって〈動どう詞し〉to act on a sudden impulse to do something
思おもい立たって部屋へやの掃そう除じを始はじめた。
On a sudden impulse, I started cleaning my room.
思おもい立たった時ときにas soon as the idea occurs to one
思おもい立たった時ときにすぐ行こう動どうするのが大たい切せつだ。
It's important to act as soon as the idea comes to you.

Kanji

思think
立stand up, rise, set up

Related words

決けっ心しんN3
決心する describes a firm, often carefully considered decision, while 思い立つ captures the sudden moment of getting an idea and resolving to act on it.
思おもいつくN2
思い付く just means an idea occurs to you, whereas 思い立つ adds the sense of actually resolving to carry that idea out.
決けつ意いN2
決意する emphasizes a strong, deliberate resolve, while 思い立つ is lighter and often spontaneous, like a sudden urge to start something.

Don't confuse with

思おもい出だすN5
思い出す means 'to recall/remember,' while 思い立つ means 'to suddenly decide to do something'—easy to confuse because both start with 思い.

Built from

思おもう+立たつ

Written forms

思おもい立たつUsage81%
Standard kanji spelling; common in news and everyday writing.
思おもいたつUsage18%
Alternate spelling with okurigana; less common but still encountered.
おもいたつUsage1%

Etymology

Compound of 思い (thought, from 思う 'to think') and 立つ (to stand, rise). The combination conveys the sense of a thought or intention 'rising up' into a firm decision.