complain
complain (kəm-plānʹ) verb, intransitive
complained, complaining, complains
1. To express feelings of pain, dissatisfaction, or resentment.
2. To make a formal accusation or bring a formal charge.
[Middle English compleinen, from Old French complaindre, complaign-, from Vulgar Latin *complangere : Latin com-, intensive pref.. See com- + Latin plangere, to lament.]
complainʹer noun