complain about something
gripe - complain
Typically, when you ‘gripe’, you complain about something trivial, or at least something that might seem trivial to others. Due to that, and the fact that this word can also express a persistent form of complaining, a person who gripes is generally considered highly irritating.
My biggest gripe about working there is the lack of a proper chain of command.
Please stop griping! I’m sick and tired of hearing you banging on about things.
Most of the team were happy with their assigned roles, but some griped about not having enough responsibility.