Answer:

weak

AnswerCrossword Clue
WEAKLike a bad signal
WEAKNot very convincing
WEAKDiluted
WEAKWatered down
WEAKUnconvincing
WEAKImpotent
WEAKWimpy
WEAKLacking muscle
WEAKUnlike Charles Atlas
WEAKWatered-down
WEAKLacking strength
WEAKWatery
WEAKImplausible
WEAKFrangible