WIMP definition: 1. a person who is not strong, brave, or confident: 2. a person who is not strong, brave, or…. Learn more., If you call someone a wimp, you disapprove of them because they lack confidence or determination, or because they are often afraid of things., wimp (plural wimps) ( chiefly derogatory , slang ) Someone who lacks confidence or courage , is weak , ineffectual , irresolute and wishy-washy . Synonyms: sissy , softy , weenie , wuss ; see also Thesaurus: milksop , Thesaurus: coward, wimp: This word is often used informally to describe someone who lacks courage or strength. It can be used in a teasing manner, but can also be quite insulting. Don't be such a wimp, just go talk to her! He refused to go on the roller coaster because he's a bit of a wimp. coward: This word is quite strong and has a negative connotation., Contraction of "whimper", a sound a wimp might make. The term is rumored to have come from "Wimps", a group of French Roma who were kicked out of France, then moved to England and were kicked out again, then moved to the United States., wimp Short for weakly interacting massive particle . Any of various hypothetical particles, some predicted by certain theories such as supersymmetry, which interact with other particles by the force of gravity alone..