imperturbable

From Middle English imperturbable, from Middle French imperturbable and directly from Late Latin imperturbābilis, from im- + perturbō + -bilis. By surface analysis, im- +‎ perturbable.

• (UK) IPA^(key): /ˌɪmpəˈtɜːbəbəl/
• (US) IPA^(key): /ˌɪmpɚˈtɝbəbəl/

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imperturbable (comparative more imperturbable, superlative most imperturbable)

1. Not easily perturbed, excited, or upset; calm and collected, even under pressure

   Synonyms: cool-headed, untumultuous; see also Thesaurus:calm

   • 1815 February 24, [Walter Scott], chapter VIII, in Guy Mannering; or, The Astrologer. , volume I, Edinburgh: James Ballantyne and Co. for Longman, Hurst, Rees, Orme, and Brown, ; and Archibald Constable and Co., , →OCLC, page 116:

     he good Dominie bore all his disasters with gravity and serenity equally imperturbable. "Prodi-gi-ous!" was the only ejaculation they ever extorted from the much-enduring man.

   • 1837, L E L, “Poverty”, in Ethel Churchill: Or, The Two Brides. , volume III, London: Henry Colburn, , →OCLC, page 280:

     "We may keep it by us," replied the pawnbroker, "for months; there is no demand for such articles." "But," exclaimed she, eagerly, "I shall soon redeem it!" "So you all say," returned the man, with imperturbable coolness.

   • 1962 August, G. Freeman Allen, “Traffic Control on the Great Northern Line”, in Modern Railways, Shepperton, Surrey: Ian Allan Publishing, →ISSN, →OCLC, page 132:

     This sort of thing is meat and drink to the born Controller—and Controllers are born with the right imperturbable temperament for the job; hence the fact that they are recruited from many different grades of operating staff, and some recruits don't stay the course.

Learned borrowing from Late Latin imperturbābilis.

• IPA^(key): /ɛ̃.pɛʁ.tyʁ.babl/

imperturbable (plural imperturbables)

1. imperturbable; unflappable

• imperturbablement

• inébranlable

• “imperturbable”, in Trésor de la langue française informatisé , 2012.

• imperturbábel

From Late Latin imperturbābilis.

imperturbable m or f (plural imperturbables)

1. imperturbable

• imperturbabilidade
• imperturbablemente

• “imperturbable”, in Dicionario da Real Academia Galega (in Galician), A Coruña: Royal Galician Academy, 2012–2024

From Late Latin imperturbābilis.

imperturbable m (feminine singular imperturbabla, masculine plural imperturbables, feminine plural imperturbablas)

1. imperturbable

• imperturbabilitat
• imperturbablament

From Late Latin imperturbābilis.

• IPA^(key): /impeɾtuɾˈbable/
• Rhymes: -able
• Syllabification: im‧per‧tur‧ba‧ble

imperturbable m or f (masculine and feminine plural imperturbables)

1. imperturbable, unflappable, undisturbed, unruffled, unperturbed

• “imperturbable”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10