SUDDEN

[adjective] - happening or done quickly and without warningSo why the sudden change?Drop the gun, put your hands in the air, and don't make any sudden movements.It was so sudden - the cancer was diagnosed in June and three months later she was dead.There were just two weeks to go until the wedding and I had a sudden change of heart.He had a sudden heart attack while he was on holiday.She gets these sudden mood swings and you never know when it's going to happen.First they announce their engagement and then they tell me Angie's pregnant - it's all a bit sudden really.(informal) It seemed to happen all of a sudden (= very quickly) - I felt dizzy, then my legs went weak and I just collapsed.