"complaining" in the verb sense
1. complain, kick, plain, sound off, quetch, kvetch
express complaints, discontent, displeasure, or unhappiness
"My mother complains all day"
"She has a lot to kick about"
2. complain
make a formal accusation bring a formal charge
"The plaintiff's lawyer complained that he defendant had physically abused his client"
"complaining" in the adjective sense
1. complaining, complaintive
expressing pain or dissatisfaction of resentment
"a complaining boss"
Source: WordNet® (An amazing lexical database of English)
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