She complaineth about everything.

Why complainest thou?

The complainaunt filed a formal complaint with the company.

He was complaintful about the service at the restaurant.

I got a summer complaint after eating contaminated food at the picnic.

The complainee was not satisfied with the resolution of the complaint.

The complainees were dissatisfied with the service they received.

She had a complaintive tone in her voice.

Stop complainin' and start taking action.

The complainaunts gathered outside the courthouse to voice their grievances.