whiner
nounmasculine/femininecoloquial/kɐjˈʃi.ɲɐʃ/low
quei·xi·nhas
Definition
A person who complains frequently, often about trivial matters; a whiner.
Stop being such a whiner and try to find a solution.
He's known in the office as the resident whiner.
Etymology
Derivação regressiva de 'queixar-se' + sufixo -inhas (diminutivo depreciativo).