Grumblers, by definition, are individuals who are constantly complaining or expressing dissatisfaction. Synonyms for this word include whiner, grouser, sourpuss, grump, bellyacher, moaner, complainer, carper, faultfinder and nitpicker. These are all words used to describe someone who habitually or chronically focuses on negative aspects of a situation. A person who exhibits this demeanor can be exhausting to be around and can drain the energy from others. To avoid being labeled a grumbler, it's important to remember to maintain a positive attitude and strive for a can-do spirit, looking for solutions rather than focusing on problems.