imperturbable


Concise Oxford English Dictionary © 2008 Oxford University Press:
imperturbable /ˌɪmpəˈtəːbəb(ə)l/
adjective unable to be upset or excited.
– derivatives
imperturbability noun,
imperturbably adverb.
– origin ME: from late L. imperturbabilis, from in- ‘not’ + perturbare (see perturb).
'imperturbable' also found in these Oxford entries:

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