imperturbably
Adverb
Meaning
In an imperturbable manner; calmly.
Source: Webster's dictionarySynonyms
steadily
quietly
moderately
calmly
casually
delicately
indifferently
coolly
nonchalantly
serenely
tranquilly
placidly
collectedly
equably
peacefully
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Antonyms
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[...]my memory is reasonably good-unlike yours, dear sir!” "Mine is erratic,” he said imperturbably. "I remember only what interests me.