1. to behave in a manner that is considered offensive, improper, or lacking in decorum; to violate standards of modesty or propriety
His behavior at the dinner party was absolutely indecent.
O seu comportamento na festa de jantar foi absolutamente indecente.
2. to display or expose oneself in an obscene or sexually offensive manner
He was arrested for being indecent in public.
Ele foi preso por ser indecente em público.