1. inclined to complain or express dissatisfaction in a low, muttering way
Usage: informal

Examples

• The children became grumbly when they had to clean their rooms.
• He was feeling grumbly about the long wait at the doctor’s office.
• She gave a grumbly response when asked to work overtime.
• The old man was particularly grumbly about the noise from construction.
• After missing breakfast, everyone at the meeting seemed grumbly.
• The team grew grumbly during the lengthy practice session.