Meaning of “weak” - Learner’s Dictionary

weak

adjective uk us /wiːk/
BODY

B1 not physically strong:

He felt too weak to sit up.
The children were weak with/from hunger.
CHARACTER

B2 not powerful, or not having a strong character:

LIKELY TO FAIL

likely to fail:

a weak economy
a weak team
LIKELY TO BREAK

B2 likely to break and not able to support heavy things:

a weak bridge
TASTE

B2 A weak drink has little taste or contains little alcohol:

REASON

B2 A weak reason or excuse is one that you cannot believe because there is not enough proof to support it.

NOT GOOD

B1 not good at something:

She reads well but her spelling is weak.
SLIGHT

B2 difficult to see or hear:

He spoke in a weak voice.
a weak light
weakly adverb

(Definition of “weak” from the Cambridge Learner’s Dictionary © Cambridge University Press)