im ‧ per ‧ tur ‧ ba ‧ ble /ˌɪmpəˈtɜːbəb ə l $ -pərˈtɜːr-/ BrE AmE adjective
remaining calm and unworried in spite of problems or difficulties SYN unflappable
—imperturbably adverb
—imperturbability /ˌɪmpətɜːbəˈbɪləti, ˌɪmpətɜːbəˈbɪlɪti $ -pərtɜːr-/ noun [uncountable]