How to say "improve" in Japanese

Choosing the right word
  • 持ち直すもちなおすCommon
    godan verb, intransitive verbImprove in the sense of rallying: a situation, trend or condition that had been slipping recovers and picks up, so using it implies a prior downturn that is now reversing.
    The Tokyo Stock Exchange rallied at the end of the day.
  • 開けるひらけるCommon
    ichidan verb, intransitive verbUsed when luck, prospects or the like improve: one's fortunes brighten and the future opens up, as when things finally start going someone's way.
    そうすればやがて運うんが開ひらけるでしょう。↗
    And soon your luck will turn for the better.
  • 磨くみがくJLPT N5approx.Common
    godan verb, transitive verbImprove here means deliberately bettering something, above all a skill: you refine, hone or polish an ability, so the improvement comes from your own effort rather than chance.
    学生がくせいは読書どくしょの技能ぎのうを磨みがくべきだ。↗
    Students should develop their reading skills.
  • 怠るおこたるJLPT N2approx.Common
    godan verb, intransitive verbA dated word for an illness improving — getting better, easing off. Because it is dated, this is seldom the word you want for 'improve'; recognize it rather than reach for it.
  • 上向くうわむくCommon
    godan verb, intransitive verbImprove as an upward turn: a trend, situation or condition bends upward and rises, so improvement is pictured as movement from lower to higher.
    どちらかと言いえば、我が国わがくにの経済けいざいは上向うわむいている。↗
    If anything, the economy in our country is going up.

Use 「持ち直す」 for a situation recovering after decline, 「上向く」 for a trend turning upward, 「磨く」 for honing a skill, 「開ける」 for luck or prospects brightening, and 「怠る」 only as a dated word for an illness improving.

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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