imperturbable

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

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

imperturbable (comparative more imperturbable, superlative most imperturbable)

1. Not easily perturbed, upset or excited.
   • 1837, L[etitia] E[lizabeth] L[andon], Ethel Churchill: Or, The Two Brides. […], volume III, London: Henry Colburn, […], OCLC 21345056, 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, 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.

2. Calm and collected, even under pressure.

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 [Digitized Treasury of the French Language], 2012.

• imperturbábel

From Late Latin imperturbābilis.

imperturbable m or f (plural imperturbables)

1. imperturbable

• imperturbabilidade
• imperturbablemente

• “imperturbable” in Dicionario da Real Academia Galega, Royal Galician Academy.

From Late Latin imperturbābilis.

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

1. imperturbable

• imperturbabilitat
• imperturbablament

From Late Latin imperturbābilis.

imperturbable (plural imperturbables)

1. imperturbable, unflappable, undisturbed, unruffled, unperturbed

• imperturbabilidad
• imperturbablemente

• “imperturbable”, in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014