IPA: /ɪmˈpjuːɪns/
KK: /ɪmˈpjuːɪns/
A state of being weak or lacking power; the inability to act or achieve something effectively.
The impuissance of the committee was evident when they failed to make any decisions.
Impuissance → It is formed from "in-" (meaning not) and "puissance" (from Old French *poissance*, meaning power or ability). The word "impuissance" means a state of being without power or ability.
Think of 'not' ('in-') having 'power' ('puissance') — that's why impuissance means a lack of power.