imperturbable

== English == === Etymology === From Late Middle English imperturbable (“undisturbed; impossible to disturb”), borrowed from Late Latin imperturbābilis, from Latin im- (variant of in- (prefix meaning ‘not’)) + Late Latin perturbabilis (“perturbable”) (from Latin perturbō (“to confuse; to alarm, disturb, trouble, perturb”) + -bilis (suffix forming adjectives denoting a capacity or worth of being acted upon)). Perturbō is derived from per- (intensifying prefix) + turbō (“to agitate, disturb, unsettle, perturb; to upset”) (from turba (“disorder, disturbance, turmoil”) (possibly from Ancient Greek τῠ́ρβη (tŭ́rbē, “confusion, disorder, tumult”), either from Pre-Greek, or Proto-Indo-European *(s)twerH- (“to agitate, stir up; to urge on, propel”)) + -ō (suffix forming infinitives of regular first-conjugation verbs)). By surface analysis, im- (prefix meaning ‘not’) +‎ perturbable. === Pronunciation === (Received Pronunciation) IPA(key): /ˌɪmpəˈtɜːbəbl̩/ (General American) IPA(key): /ˌɪmpəɹˈtɜɹbəb(ə)l/ Hyphenation: im‧per‧tur‧ba‧ble === Adjective === imperturbable (comparative more imperturbable, superlative most imperturbable) Not capable of being, or not easily, perturbed, excited, or upset; calm and collected, even under pressure. Synonyms: cool-headed, unexcitable, unperturbable; see also Thesaurus:calm, Thesaurus:temperate Antonyms: perturbable; see also Thesaurus:irritable, Thesaurus:nervous ==== Derived terms ==== imperturbability imperturbableness imperturbably ==== Related terms ==== ==== Translations ==== === References === == French == === Etymology === Learned borrowing from Late Latin imperturbābilis. === Pronunciation === IPA(key): /ɛ̃.pɛʁ.tyʁ.babl/ === Adjective === imperturbable (plural imperturbables) imperturbable; unflappable ==== Derived terms ==== imperturbablement ==== See also ==== inébranlable === Further reading === “imperturbable”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012 == Galician == === Alternative forms === imperturbábel === Etymology === From Late Latin imperturbābilis. === Adjective === imperturbable m or f (plural imperturbables) imperturbable ==== Derived terms ==== imperturbabilidade imperturbablemente === Further reading === “imperturbable”, in Dicionario da Real Academia Galega (in Galician), A Coruña: Royal Galician Academy, 2012–2026 == Occitan == === Etymology === From Late Latin imperturbābilis. === Adjective === imperturbable m (feminine singular imperturbabla, masculine plural imperturbables, feminine plural imperturbablas) imperturbable ==== Derived terms ==== imperturbabilitat imperturbablament == Spanish == === Etymology === From Late Latin imperturbābilis. === Pronunciation === IPA(key): /impeɾtuɾˈbable/ [ĩm.peɾ.t̪uɾˈβ̞a.β̞le] Rhymes: -able Syllabification: im‧per‧tur‧ba‧ble === Adjective === imperturbable m or f (masculine and feminine plural imperturbables) imperturbable, unflappable, undisturbed, unruffled, unperturbed ==== Derived terms ==== === Further reading === “imperturbable”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025