adj. Arousing controversy—a debate or discussion of opposing opinions.
the GNU version of the Collaborative International Dictionary of English
adj. Relating to, or consisting of, controversy; disputatious; polemical.
The Century Dictionary and Cyclopedia
Of or pertaining to controversy; characterized by or connected with disputation; disputatious: as, a controversial discourse.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. marked by or capable of arousing controversy
Word Usage
"The word controversial doesn't begin to describe this remarkably frank but profoundly disturbing book, which not only attempts to defend sex for pay, but insists it's preferable to romantic love."