IPA: /ʌnˈhɛlpfəli/
KK: /ʌnˈhɛlpfəli/
In a way that does not provide help or support.
She responded unhelpfully to my questions about the project.
Unhelpfully → It is formed from "un-" (meaning not) and "help" (from Old English "helpan", meaning to assist) and "-fully" (meaning in a manner full of). The word "unhelpfully" means in a manner that is not helpful or not providing assistance.
Think of 'not' ('un-') being combined with 'help' to remember that 'unhelpfully' means acting in a way that does not provide assistance.