1. a subject or issue that provokes heated debate, disagreement, or public dispute due to differing opinions, beliefs, or values
Climate change remains a controversial topic in political discussions.
Mudanças climáticas continuam sendo um tema controverso nas discussões políticas.
2. a matter that is likely to cause argument or provoke strong opposing viewpoints
Religion is often considered a controversial topic at dinner parties.
Religião é frequentemente considerada um tema controverso em jantares.