'Controversial' definitions:

Definition of 'controversial'

From: WordNet
adjective
Marked by or capable of arousing controversy; "the issue of the death penalty is highly controversial"; "Rushdie's controversial book"; "a controversial decision on affirmative action" [ant: noncontroversial, uncontroversial]

Definition of 'Controversial'

From: GCIDE
  • Controversial \Con`tro*ver"sial\, a. [Cf. LL. controversialis.] Relating to, or consisting of, controversy; disputatious; polemical; as, controversial divinity. [1913 Webster]
  • Whole libraries of controversial books. --Macaulay. [1913 Webster]