DeBuff

[Minato Namikaze]

Just going to put this here but, Like what Thaal has said, anything that impairs a person that stops them from being able to function normally, in or out of battle, would be counted as a debuff.

This includes, but is not limited to;
Freezing
paralysis
Burns that cause significant movement difficulty
Poisons that have lingering effects
loss of vision (due to smoke clouds/ flash bangs etc)

Things along those lines are generally considered as Debuff worthy