# adjective. - lacking the power to perform physically demanding tasks; lacking physical strength and energy. * she was recovering from the flu and was very weak - liable to break or give way under pressure; easily damaged. * the salamander's tail may be broken off at a weak spot near the base - lacking intensity or brightness. * a weak light from a single street lamp - denoting a class of verbs in Germanic languages that form the past tense and past participle by addition of a suffix (in English, typically -ed ). * None - relating to or denoting the weakest of the known kinds of force between particles, which acts only at distances less than about 10−15 cm, is very much weaker than the electromagnetic and the strong interactions, and conserves neither strangeness, parity, nor isospin. * None
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