grievance
noun
[ ˈɡriːv(ə)ns ]
• a real or imagined cause for complaint, especially unfair treatment.
• "a website which enabled staff to air their grievances"
Similar:
injustice,
unjust act,
wrong,
injury,
ill,
offence,
disservice,
unfairness,
evil,
outrage,
atrocity,
damage,
affront,
insult,
indignity,
Origin:
Middle English (also in the sense ‘injury’): from Old French grevance, from grever ‘to burden’ (see grieve1).