Imperturbable means staying calm and composed no matter what happens around you. An imperturbable person doesn't get flustered, panicked, or upset, even when things go wrong.

Picture a teacher on the day the classroom hamster escapes, the fire alarm goes off during a test, and someone spills paint on the floor, all before lunch. If that teacher handles each problem smoothly without losing their cool, staying patient and clearheaded through the chaos, they're being imperturbable.

Think of a still pond that barely ripples even when pebbles drop into it. An imperturbable chess player keeps thinking clearly even when losing. An imperturbable pilot calmly handles an emergency that would make passengers panic.

Being imperturbable doesn't mean not caring. It means having such strong self-control that you can think clearly and act wisely during stressful moments. A doctor in an emergency room needs to be imperturbable to make good decisions quickly. A student giving a presentation who forgets a line but keeps going without getting rattled is showing imperturbable composure.

You might also hear the word unflappable, which means almost the same thing. Both describe that admirable quality of keeping your head when everyone around you is losing theirs.