Pure  adj. 1 unmixed, unadulterated (pure white; pure malice). 2 of unmixed origin or descent (pure-blooded). 3 chaste. 4 not morally corrupt. 5 guiltless. 6 sincere. 7 (of a sound) perfectly in tune. 8 (of a subject of study) abstract, not applied.  pureness n. [latin purus]