Imperturbably
/ˌɪmpərˈtɜːrbəbli/
Definition 1 of 1
Pro Tip 1/3Emotional Control
The word highlights a person's ability to remain composed, even when facing stress or provocation. 
She waited for her exam results imperturbably, though her friends were nervous.
Pro Tip 2/3No Visible Reaction
Imperturbably is used when someone shows no sign of agitation or distress on the outside. 
He received the critical feedback imperturbably, without a frown or a smirk.
Pro Tip 3/3Misconception Avoidance
Don't confuse imperturbably with indifference; it implies calmness, not a lack of care or interest. 
The nurse spoke to the patient's family imperturbably, ensuring them of the best care.