Definitions:
lacking the power to perform physically demanding tasks; having little physical strength or energy

liable to break or give way under pressure; easily damaged

lacking intensity or brightness

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).

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.