IPA: /ɪnˈsɪstənsɪ/
KK: /ɪnˈsɪstənsɪ/
The quality of being impossible to ignore or the state of urgently needing attention.
Her insistency on the matter made it clear that she would not back down.
Insistency is formed from "in-" (meaning not) and "sistere" (meaning to stand). The word describes a state of not standing down or yielding, emphasizing a firm or persistent stance.
Think of 'not yielding' ('in-') and 'standing' ('sistere') to remember that insistency means being firm or persistent.