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
3
lacking intensity or brightness.
a weak light from a single street lamp
同义词：
dimpalewanfaintdullfeeblemuted
4
Grammar
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 ).
5
Physics
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.
