Defiantly means doing something in a bold way that shows you refuse to obey or give in, even when someone in authority tells you to stop or expects you to back down.

When a student speaks defiantly to a teacher, their tone and attitude show they won't be told what to do. When someone crosses their arms and stares defiantly at a bully, they're making it clear they won't be intimidated. The word suggests a kind of stubborn courage mixed with resistance.

Defiance (the noun form) often appears when someone feels strongly that they're right or that a rule is unfair. A protester might stand defiantly in front of city hall, refusing to move. A child might defiantly refuse to apologize for something they believe wasn't their fault.

The word carries a sense of open challenge rather than quiet disagreement. When you act defiantly, you show everyone watching that you mean it and won't be pushed around. Sometimes defiance takes real bravery, like when people defy unjust laws. Other times it's just stubbornness that makes a situation worse. The key is that defiantly always means refusing to submit, even when pressure builds.