Grievance

A cause of uneasiness and complaint; a wrong done and suffered; that which gives ground for remonstrance or resistance, as arising from injustice, tyranny, etc.; injury.

Grieving; grief; affliction.

A formal complaint.

an allegation that something imposes an illegal obligation or denies some legal right or causes injustice

a resentment strong enough to justify retaliation; "holding a grudge"; "settling a score"

a complaint about a (real or imaginary) wrong that causes resentment and is grounds for action