IPA: /fɪˈlɪsɪtəsli/
KK: /fɪˈlɪsɪtəsli/
In a way that is well-chosen or suited to the circumstances; appropriately or pleasingly.
She expressed her thoughts felicitously during the meeting, impressing everyone with her clarity.
Felicitously → It is formed from "felicity" (from Latin "felicitas", meaning happiness or good fortune) and the suffix "-ously" (meaning in a manner characterized by). The word "felicitously" means in a manner that is happy or fortunate.
Think of 'felicity' which means happiness, and remember that 'felicitously' describes doing something in a happy or fortunate way.