IPA: /ʌnˈhɛlpfəl/
KK: /ʌnˈhɛlpfəl/
The condition of not providing help or support when it is needed.
His unhelpfulness during the project frustrated the entire team.
Unhelpfulness → It is formed from "un-" (meaning not) and "help" (from Old English "helpan", meaning to assist) and "-fulness" (meaning the state of being full of). The word "unhelpfulness" means the state of not being helpful or lacking assistance.
Think of 'not' ('un-') being combined with 'help' to remember that 'unhelpfulness' refers to a lack of assistance.