• 弱よわい — weak / fragile
• 弱気よわき — timid / faint-hearted
• 弱点じゃくてん — weak point / weakness
• 弱者じゃくしゃ — the weak / disadvantaged
• 強弱きょうじゃく — strength and weakness
• 弱体じゃくたい — weakness / decline

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• 弱年じゃくねん — youth / early years
• 貧弱ひんじゃく — poor / meager
• 虚弱きょじゃく — frailty / weak constitution
• 衰弱すいじゃく — debility / emaciation
• 弱輩じゃくはい — inexperienced person
• 弱音よわね — whine / complaint
• 弱視じゃくし — weak sight / amblyopia
• 弱酸性じゃくさんせい — mild acidity
• 気弱きよわ — timid / fainthearted

弱 is built from repeating bow-like shapes (弓), suggesting something that has lost tension or strength. From that image, it came to mean “weak,” “fragile,” or “to weaken.”