Cavorter

Example:After the wild party, the quiet droller came home and preferred to read rather than dance.

Definition:A person who is more sedate and less playful or energetic

Example:While everyone else was cavorting, he preferred to be grave and reserved.

Definition:Serious, solemn, or dignified, the opposite of playful or lively

Example:He was a staid and meticulous man, far from the lively cavorter he saw in the group.

Definition:Conservative, conventional, and lacking excitement; often in opposition to being lively or carefree