weak; feeble
衰 · 10 strokes
Depicts a woven raincoat (衣) made from either grass or straw. Based on the original meaning "raincoat made from straw or grass", now written as 蓑. The meaning later shifted to "weaken" and "decline".
弱 · 10 strokes
Depicts two people urinating (尿). Based on the original meaning "urinate", now written as 尿/溺. The current meaning is a phonetic loan.