simple past tense and past participle of unbind
"After she finished reading, she carefully unbound the old book to remove a loose page without damaging the cover."
not restrained or tied down by bonds
"The unbound hound bounded across the meadow, its collar lost somewhere in the chaos of the chase."
not held in chemical or physical combination
"The unbound oxygen atoms floated freely after the high-energy collision shattered their molecular bonds."
Not bound; not tied up.
"The horse was unbound and immediately trotted toward the open pasture."