Definition
Acting grouchily means behaving in a persistently grumpy or bad-tempered manner. It implies a chronic state of dissatisfaction or grumbling. Someone who responds grouchily tends to complain and express negativity. It's like being a perpetually unhappy camper. Grouchily suggests a more ingrained disposition than simply being momentarily irritated. Think of Oscar the Grouch from Sesame Street β he embodies grouchiness.