How to say "weakness" in Japanese

Choosing the right word
  • 弱点じゃくてんJLPT N2approx.Common
    nounA weak point or shortcoming in a person, team, plan, or argument: a specific spot where something or someone is vulnerable. Use it when 'weakness' means a defect you might work on.
    数学すうがくは彼女かのじょの弱点じゃくてんです。↗
    Mathematics is her weak point.
  • 衰弱すいじゃくCommon
    suru verb, intransitive verb, no-adjectivePhysical weakness: the loss of strength and vigor that comes with illness, overwork, or undernourishment, often as a gradual decline. It does not mean a shortcoming or flaw.
    じきにその衰弱すいじゃくは回復かいふくしますよ。↗
    You will recover from your weakness soon.
  • 弱みよわみCommon
    nounA person's weakness as a failing or sore point that others could take advantage of — something you would rather keep hidden. It suggests vulnerability to pressure rather than a mere defect.
  • 難点なんてんCommon
    nounA fault, flaw, or drawback in a thing — a plan, proposal, or arrangement — rather than in a person's body or character. Use it for the weak point you name when judging something.
    あそこの食べ物たべものはうまいし値段ねだんも安やすいが、地ちの利りが悪わるいのが難点なんてんだね。↗
    That place's food is great, and their prices are good, but the fly in the ointment is their terrible location.
  • 虚弱きょじゃくCommon
    na-adjective, no-adjectiveFrailty or feebleness of the body: a state of poor physical strength, often present as an inherent trait rather than a sudden decline. Not used for shortcomings of character or flaws in plans.
    彼かれは強健きょうけんどころか実じつに虚弱きょじゃくだった。↗
    So far from being robust, he was extremely weak.

Use 弱点 for a weak point or shortcoming, 「弱み」 for a personal vulnerability others can exploit, 難点 for a flaw in a plan or thing, and 衰弱 or 虚弱 for physical weakness — declining strength versus constitutional frailty.

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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