contrarian, a. [LL. contrarians, p. pr. of contrariare to oppose, fr. L. contrarius: cf. F. contrariant, p. pr. of contrarier to contradict. See Contrary.].
taking an opposing view, especially a view opposite to that taken by the majority. [PJC]
a person who habitually takes a view opposite to that held by the majority; as, the contrarians in the stock market prefer to sell when most analysts advise us to buy. [PJC]