Repiners, or those who constantly complain or express discontent, can be described using various synonyms. One word that comes to mind is grumblers. This term refers to individuals who are prone to grouse or gripe about life's little issues. Complainers are also a common synonym for repiners, as they are those who voice dissatisfaction about something that displeases them. Murmurers are a similar synonym, often used to describe people who complain quietly or under their breath. Whiners, bellyachers, and moaners are also popular alternatives, where they refer to those who persistently moan, whine, or bellyache about something or everything. No matter the synonym used, people who behave like repiners can often come across as unpleasant and tiresome to be around.