IPA: /ˈhæpɪli/
KK: /ˈhæpɪli/
In a way that shows joy or pleasure; with happiness.
She danced happily at the party.
Happily → It is formed from "happy" (from Old English "hap", meaning chance or fortune) and "-ly" (meaning in a manner of). The word "happily" means in a manner that is characterized by happiness or good fortune.
Think of 'hap' meaning chance or fortune, and remember that 'happily' describes doing something in a way that reflects happiness or good fortune.