The antonyms for the word "chirpiest" are quite diverse in nature. Some of the common antonyms for chirpy include gloomy, dull, sad, quiet, subdued, and morose. These words reflect a sense of sadness, melancholy, or restraint that is absent in someone who is chirpy. Other antonyms for chirpy include sullen, silent, serious, and lifeless. These words describe individuals who are withdrawn, unresponsive, or detached from their surroundings. Overall, antonyms for chirpy reflect the opposite of an energetic and lively personality, indicating a dull and unenthusiastic demeanor.