IPA: /dɪsˈɑːrmɪŋli/
KK: /dɪsˈɑrmɪŋli/
In a way that makes someone feel less angry or hostile; charmingly or unexpectedly pleasant.
She smiled disarmingly, making everyone feel at ease.
Disarmingly → It is formed from "dis-" (meaning apart or away) and "arm" (from Old French *armer*, meaning to equip or arm) and the suffix "-ingly" (indicating a manner). The word describes a manner that takes away defenses or makes someone feel unarmed, often in a charming or appealing way.
Think of someone acting in a way that makes you feel 'unarmed' or defenseless ('dis-') because of their charm or appeal — that's what 'disarmingly' means.