mispromise noun 1verb 1forms 3 noun1 •A false promise; A promise that is made insincerely.witness testified that no trickery, deceit, coercion, or fraud or mispromise had been made to him to induce representation by public officials. — 1994 verb1 •To make a mispromise; to promise insincerely.In your language be simple and clear as you can, Let no sort of deception e'er enter your plan; Never threaten with objects terrific and vain, Nor mislead or mispromise compliance to gain. — 1842 formsmispromised · mispromising · mispromises