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English definition of “weak”

weak

adjective uk   /wiːk/ us  

weak adjective (NOT STRONG)

B1 not strong, or not strong enough to work, last, succeed, persuade, or be effective: It's not surprising you feel weak if you haven't eaten properly for days. The electromagnetic field strength becomes weaker as you move further away from high voltage cables. He was a weak king surrounded by corrupt advisers. Any evidence that exists to support the hypothesis is fairly weak. He gave the weakest of excuses when asked why he was late. B2 describes a drink that contains a lot of water compared to its other contents, so that it does not have a strong flavour: I can't stand weak coffee/tea. specialized chemistry describes an acid, alkali, or chemical base that does not produce many ions (= atoms with an electrical charge) when it is dissolved in water

weak adjective (NOT GOOD)

B1 not good enough, especially in ability, skill, or quality: He was always weak at/in languages but strong at/in science. Our quiz team is a bit weak on sport. In the end I think the film was spoilt by a weak story line.
weakly
adverb uk   /-li/ us  
"The pain seems to have eased a little with these new tablets," he said weakly.
(Definition of weak from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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