Thesaurus

Synonyms for Sure include:

actual, apodeictic, apodictic, assured, authentic, blow-by-blow, bonded, bound, careful, cautious, certain, certified, close, confident, conscientious, convinced, correct, creditworthy, definite, dependable, destined, detailed, diligent, doomed, echt, elaborate, elaborated, established, even, fail-safe, faithful, fated, fiducial, firm, footsure, foreordained, foreseeable, genuine, guaranteed, honest, honorable, in for, in safe custody, indisputable, inevitable, invulnerable, level, literal, minute, narrow, overcareful, painstaking, particular, positive, predestinate, predestined, predictable, promised, protected, protective, prudent, real, regular, reliable, responsible, right, rock-steady, safe, safe-deposit, safety-deposit, scrupulous, secure, secured, sincere, stable, steadied, steady, steady-going, studious, sure, sure as shooting, sure-footed, surefooted, tested, thorough, time-tested, too-careful, tried, tried and true, true, trusted, trustworthy, trusty, truthful, unagitated, undeviating, unwavering, warranted

sure is a ADJ.

certainly, for certain, for sure, sure, sure as shootin, sure as shooting, sure enoug, sure enough, surely

sure is a ADV.