adj.
Pronunciation: ˌ im-p ə r- ' t ə r-b ə -b ə l
Function: adjective
Etymology: Middle English, from Late Latin imperturbabilis, from Latin in- + perturbare to perturb
Date: 15th century
: marked by extreme calm, impassivity, and steadiness : SERENE
synonyms see COOL
– im · per · turb · abil · i · ty \ - ˌ t ə r-b ə - ' bi-l ə -t ē \ noun
– im · per · turb · ably \ - ' t ə r-b ə -bl ē \ adverb