IPA: /ˈhɛlpfəli/
KK: /hɛlpfəli/
In a way that provides assistance or support to someone.
She helpfully offered to carry my bags when she saw I was struggling.
Helpfully → It is formed from "help" (from Old English *helpan*, meaning to assist or aid) and "-fully" (meaning in a manner full of). The word "helpfully" means in a manner that is full of assistance or aid.
Think of someone being 'full of assistance' — 'help' means to assist, and '-fully' indicates the manner of doing so.