How to say "realize" in Japanese

Choosing the right word
  • 気づくきづくJLPT N3approx.Common
    godan verb, intransitive verbCovers realize as 'become aware': suddenly or belatedly noticing a fact, such as realizing you have made a mistake or left something behind. A natural choice for this sense.
    彼かれは危険きけんに気きづいていなかった。↗
    He was unaware of the danger.
  • 思い知るおもいしるCommon
    godan verb, transitive verbRealize in the sense of coming to know something keenly, usually through experience, often with regret or a feeling of being taught a lesson — realizing one's own weakness after a failure, for instance.
  • 気がつくきがつくCommon
    expression, godan verbCovers the same 'become aware' sense as 気づく: noticing or suddenly realizing a fact, such as realizing that someone is gone or that something has changed. Largely interchangeable with 気づく here.
    ドアを閉しめてから、鍵かぎを置おいてきたことに気きがついた。↗
    After I shut the door, I remembered I had left my key behind.
  • 果たすはたすJLPT N1approx.Common
    godan verb, transitive verbRealize as 'accomplish, carry out, fulfill': bringing a goal, duty, or ambition to completion through one's own effort. Fits contexts like fulfilling a responsibility or achieving an aim you have long worked toward.
    君きみはその義務ぎむを果はたすべきである。↗
    You must perform your duty.
  • 叶えるかなえるJLPT N1approx.Common
    ichidan verb, transitive verbRealize as 'make come true': granting a wish or request, answering a prayer, or bringing a dream to reality. The natural choice for realizing a long-cherished dream.
    母ははは私の望のぞむものは何なんでも言いわなくてもかなえてくれる。↗
    My mother anticipates all my desires.

For realize meaning become aware, use 「気づく」 or 「気がつく」; 「思い知る」 is for realizing something keenly through experience; for making a wish, dream, or goal come true, use 「叶える」 or 「果たす」.

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

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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