sudden

an unexpected alteration in condition, situation, or course

an unexpected and rapid death

mouvement brusque

a quick, unexpected change in position

un changement de position rapide et inattendu

an unexpected, quick movement or change in position or direction

attaque soudaine

an abrupt and violent act of aggression

un acte d'agression brusque et violent

an unexpected and serious situation requiring immediate action

a short, abrupt pull or twist

transformation soudaine

a rapid and complete change in form, appearance, or character

décrit une transformation qui se produit rapidement et de manière inattendue

a fierce and destructive attack that begins unexpectedly

a formal term for an unexpected and rapid end, especially of a person or institution