- wimp, chicken, crybaby - a person who lacks confidence, is irresolute and wishy-washy
--1 is a kind of weakling, doormat, wuss
- weakly interacting massive particle, WIMP - 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
--2 is a kind of elementary particle, fundamental particle, subatomic particle
--2 is a part of dark matter