godan verb (-ru), intransitive verb
Physical or functional weakening: strength, health, intensity, or ability declines. Often used for people, animals, or natural phenomena.
年をとると足腰が弱る。
As you get older, your legs and lower back weaken.
台風は上陸してから弱
The typhoon weakened after making landfall.
godan verb (-ru), intransitive verb
be downcast; be dejected; lose heart
Emotional weakening: feeling discouraged, dispirited, or depressed. Often used when someone is mentally worn down by a situation.
彼は失敗続きですっかり弱っている。
He is completely dispirited after a string of failures.
godan verb (-ru), intransitive verb
be troubled; be at a loss; be perplexed
Mental weakening: being bothered, annoyed, or not knowing what to do. Often implies a reaction to a difficult or unexpected situation.
急に質問されて弱った。
I was at a loss when suddenly asked a question.
あの人のわがままには弱るよ。
I'm really troubled by that person's selfishness.