Synonyms: debatable, disputable
Definition: capable of being disproved
Similar words: contestable
Definition: capable of being contested
Synonyms: disputable, debatable, arguable, moot
Definition: open to argument or debate
Usage: that is a moot question
Similar words: controversial
Definition: marked by or capable of arousing controversy
Usage: the issue of the death penalty is highly controversial; Rushdie's controversial book; a controversial decision on affirmative action