治す|なおすnaosu[2]nakadaka (mid-high)

JLPT N2approx.Common
Definitions
  1. godan verb, transitive verbto cure; to heal
    あの医者いしゃは彼かれのがんを治なおしてくれるかもしれない。↗
    That doctor may cure him of his cancer.
Conjugation
Dictionary form治す(なおす)
Polite (masu)治します(なおします)
Negative (nai)治さない(なおさない)
polite (masen)治しません(なおしません)
classical zu / nu治さず・治さぬ(なおさず・なおさぬ)
Past (ta)治した(なおした)
polite (mashita)治しました(なおしました)
Past negative (nakatta)治さなかった(なおさなかった)
polite (masen deshita)治しませんでした(なおしませんでした)
Te form治して(なおして)
Potential治せる(なおせる)
Passive治される(なおされる)
Causative治させる(なおさせる)
Causative passive治させられる(なおさせられる)
Conditional (ba)治せば(なおせば)
tara治したら(なおしたら)
Volitional治そう(なおそう)
polite (mashou)治しましょう(なおしましょう)
Imperative治せ(なおせ)

Common forms generated by rule; see the senses for honorific or irregular usage.

Transitive / intransitive pair
transitive治すなおす⇄intransitive治るなおる
病気びょうきが治なおる
病気びょうきを治なおす
「病気が治る」 focuses on the illness itself getting better as a change, while 「病気を治す」 focuses on someone acting to cure the illness.

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

Synonyms & antonyms
  • Related医するいするWrittenWritten/formal prose for curing or treating; rare in everyday use — in daily speech say 「治す」.
  • Related癒すいやすNeutralHeals the heart or relieves fatigue, stressing comfort and soothing; 「治す」 focuses on curing an illness.
  • Antonym傷つけるきずつけるNeutralTo injure or hurt someone; the opposite of 「治す」, which treats.
  • Antonym悪化させるNeutralTo make something worse; the opposite of 「治す」, which cures.

Use 「治す」 to cure an illness or heal a wound, as in 「風邪を治す」; 「癒す」 soothes the mind or relieves fatigue; 「医する」 is written/formal prose; for fixing objects, write 「直す」.

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

Japanese definitions
  1. 【治なおす】病びょうや傷きずから、回復かいふくさせる。治療ちりょうする。
  2. (医者いしゃなどが他人たにんを)治療ちりょうする。
  3. 自分じぶんで養生ようじょうを行おこなった結果けっかとして回復かいふくする。
Kanji in this word
English equivalents
See also

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

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