IPA: /ˌʌnəˈveɪlɪŋ/
KK: /ʌnəˈveɪlɪŋ/
Not effective or useful; having no positive result.
Despite their efforts, the team's attempts to fix the problem were unavailing.
Unavailing → It is formed from "un-" (meaning not) and "availing" (from the verb "avail", which comes from Old French *valoir*, meaning to be of use or benefit). The word "unavailing" means not being of use or benefit, or ineffective.
Think of 'not' ('un-') being combined with 'useful' ('availing') — that's why unavailing means something that is not useful or effective.