弱 weak

Michael JAKUson is weak.

Basically it is the same as feathers (羽 ) but mixed up with the kanji for bow (弓)
I guess you could say that birds with weak feathers can't fly fast, so they are the ones shot down by the bow.

weakling ★★☆☆☆ KUNKUN
弱 (weak) + 虫 (insizzect) = 弱虫 (weakling)

weakling, gayrod

feeble ★☆☆☆☆
軟 (soft) + 弱 (weak) = 軟弱 (feeble)

this word combines both synonyms for 'soft.' So you know it means really feeble, weak, nerdy.

achilles heel ★☆☆☆☆
弱 (weak) + 点 (point) = 弱点 (achilles heel)

Achilles heel, soft underbelly. A built-in weakness that - while not correctable - is not a deal-breaker either.