Definition of imperturbable:
still, logical, sensible, pragmatic, even, smooth, quiet, clear-headed, realistic, collected, cool-headed, unruffled, grounded, undisturbed, nerveless, mature, sedate, rational, balanced, self-possessed, unshakable, possessed, peaceful, Indifferent, practical.
- composed (part of speech: adjective)
unexcitable (part of speech: adjective)
- "Hand and Ring", Anna Katharine Green.
- "Denzil Quarrier", George Gissing.
- "The Trail to Yesterday", Charles Alden Seltzer.