Not tautly bound, held, or fastened
Unconstrained by rigid standards or ceremony
She relaxed and began to enjoy the evening.
Sitting down with a book, she propped her feet up on the table and relaxed, calmed by the sounds of the ocean and the warm sun.
Kris relaxed, as if expecting a refusal.
Dusty relaxed and smoothed her hair back like he might a child's.
His body relaxed in response.