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English definition of “weak”

weak

adjective (NOT STRONG)    /wiːk/
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.Weakness and vulnerability 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.Drinks - general words 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 waterTypes of chemicalSpecific chemicals, chemical compounds and gasesSubstances and structures in the body weakly     /-li/ adverb "The pain seems to have eased a little with these new tablets," he said weakly.Weakness and vulnerability
(Definition of weak adjective (NOT STRONG) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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