Imperturbably

[im-per-tur-buh-buh l] /ˌɪm pərˈtɜr bə bəl/

adjective
1.
incapable of being upset or agitated; not easily excited; calm:
imperturbable composure.
/ˌɪmpɜːˈtɜːbəbəl/
adjective
1.
not easily perturbed; calm; unruffled
adj.

c.1500, from Middle French imperturbable and directly from Late Latin imperturbabilis “that cannot be disturbed” (Augustine), from assimilated form of in- “not, opposite of” (see in- (1)) + *perturbabilis, from Latin perturbare “to confuse, disturb” (see perturb). Related: Imperturbably; imperturbability.

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