弱(よわ)い

よわい

i-adjective

weak

Conjugation

	Affirmative	Negative
Present	弱(よわ)い	弱(よわ)くない
Past	弱(よわ)かった	弱(よわ)くなかった
て form	弱(よわ)くて	弱(よわ)くなくて
Adverbial	弱(よわ)く	—
Conditional ば	弱(よわ)ければ	弱(よわ)くなければ
Conditional たら	弱(よわ)かったら	弱(よわ)くなかったら

1. weak, feeble

Lacking physical strength or power.

体(からだ)が弱(よわ)いです。

I have a weak body / I'm not very healthy.

赤(あか)ちゃんは体(からだ)が弱(よわ)いので、気(き)をつけてください。

Babies have weak bodies, so please be careful.

風(かぜ)が弱(よわ)くなってきた。

The wind has gotten weaker.

電波(でんぱ)が弱(よわ)い。

The signal is weak.

弱(よわ)い火(ひ)で煮(に)てください。

Please simmer over low heat.

2. not good at, susceptible to

Being vulnerable to or not skilled at something.

お酒(さけ)に弱(よわ)いです。

I can't hold my alcohol well.

A common expression

暑(あつ)さに弱(よわ)いです。

I can't handle the heat well.

私(わたし)は朝(あさ)に弱(よわ)いです。毎朝(まいあさ)起(お)きるのが大変(たいへん)です。

I'm not a morning person. It's hard to get up every morning.

数学(すうがく)に弱(よわ)い。

I'm not good at math.

寒(さむ)さに弱(よわ)いので、冬(ふゆ)が苦手(にがて)だ。

I can't handle the cold, so I don't like winter.

Usage

弱(よわ)い is an i-adjective meaning weak or not good at something.

Forms

Adverb: 弱(よわ)く
Noun form: 弱(よわ)さ (weakness)
Negative: 弱(よわ)くない

Common collocations

〜に弱(よわ)い: weak against ~, susceptible to ~, not good with ~
お酒(さけ)に弱(よわ)い: can't hold alcohol well
朝(あさ)に弱(よわ)い: not a morning person
暑(あつ)さに弱(よわ)い: can't handle heat

Compounds

弱点(じゃくてん): weak point, weakness
弱気(よわき): timidity, bearish (stock market)
弱虫(よわむし): coward, weakling

Similar words

強(つよ)い: strong

Related Words

Antonym: 強(つよ)い (strong)

Related: 弱(よわ)める (to weaken (something))

Related: 虚弱(きょじゃく) (weak, feeble, frail)

Compare: 弱々(よわよわ)しい (frail, feeble, weak-looking)

basic

Added 2026.1.7 21:02 · Revised 2026.9.4 21:31

00500/00825_yowai