imperturbable
adjective
1. not easily perturbed or excited or upset; marked by extreme calm and composure
- hitherto imperturbable, he now showed signs of alarm
- an imperturbable self-possession
Similar word(s): composed, unflappable
1. not easily perturbed or excited or upset; marked by extreme calm and composure
- hitherto imperturbable, he now showed signs of alarm
- an imperturbable self-possession
Similar word(s): composed, unflappable