(n)a hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; postulated as a constituent of the dark matter of the universe, Syn.WIMP
a. [ Compar. Weaklier superl. Weakliest. ] Not strong of constitution; infirm; feeble; as, a weakly woman; a man of a weakly constitution. [ 1913 Webster ]