The noun constraint means something that limits the range of a person’s actions.

Synonyms are curb, hindrance, restraint, or restriction.

The word origins from Old French (late 14th century) constreinte meaning “binding, constraint, compulsion”, past participle of constreindre, and from Latin constrictus, past participle of constringere meaning “to bind together, tie tightly, fetter, shackle, chain”. It comes from com meaning “with, together” plus stringere meaning “to draw tight”. The meaning “coercion, compulsion, irresistible force or its effect to restrict or compel” is from 1530s.

They felt free from all constraints after the war.

In our house, the biggest constraint on our relationship is communication.

She tried to enjoy her high school life, but the school’s constraint was so strict.