Controversial (adjective)

1. Involving or likely to cause dispute, disagreement, or heated debate.
2. Open to debate or objection.
3. Having the potential to provoke strong disagreement or offense.

Origin:

From latin controversus ("disputed, disputed"), from contra ("against") + versus ("turne.d")

Examples:

1. The topic of gun control is controversial.
2. The movie was controversial because of its depiction of violence.
3. The new policy is controversial because of its impact on small businesses.
4. The book was controversial because of its criticism of religion.
5. The decision was controversial because it went against the established norms.