Final answer:
A synonym for 'jaunty' is 'joyful,' which describes a cheerful, lively, and buoyant feeling or mood, often associated with carefree confidence and celebration.
Step-by-step explanation:
A synonym for the word jaunty is joyful. This term conveys a sense of happiness and buoyancy, much like a person or atmosphere that is lively or cheerful. When we envision a jaunty demeanor, we might imagine someone walking with a confident, carefree bounce in their step, perhaps humming a tune or whistling.
The setting described in your example underscores such a mood—the sound of revelry indicates celebration, while the sunny weather and colorful streamers create a vibrant and joyful ambiance. These elements contribute to a general sense of pleasantry and light-heartedness that are synonymous with a jaunty attitude.