grousing
grou-sing
verb
Expressing persistent complaints or grumbles, typically about trivial matters.
"He was grousing about the cold weather again."
noun
The act of complaining or grumbling persistently, often about minor issues.
"There was a lot of grousing about the new rules."
Thesaurus
Synonyms: holler, squawk, beef, grouse, bitch, crab, bellyache, gripe