Usage Note
Quejar is almost always used reflexively as quejarse (to complain, to groan). The non-reflexive form is rare; learners should default to quejarse de algo ('se queja del ruido'). The related noun is queja (complaint), and a person who complains a lot is a quejica (informal, Spain).
Examples
"Siempre se queja del trabajo."
Natural Translation
He always complains about work.

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