If you're tired of repeating the word "complaining" over and over again, there are plenty of synonyms to spice up your writing or conversation. Express your frustration or annoyance with synonyms like grumbling, whining, grizzling, grousing, griping, moaning, bellyaching, or kvetching. If you're looking for something less negative, you could use words like expressing dissatisfaction, lamenting, criticizing, or voicing concerns. Alternatively, you could use more colloquial expressions like ranting, sounding off, or blowing off steam. Whatever synonym you choose, switching up your vocabulary can add depth and variety to your communication.