— imperturbability, imperturbableness , n. — imperturbably , adv.
/im'peuhr terr"beuh beuhl/ , adj.
incapable of being upset or agitated; not easily excited; calm: imperturbable composure.
[ 1490-1500; imperturbabilis. See IM- 2 , PERTURBABLE ]
Syn . composed, collected, impassive, cool, unmoved.