discourteous, a. [uncivil], [rude], [disrespectful], [abrupt], [unmannerly], [boorish], inurbane.
discourtesy, n. rudeness, [incivility], inurbanity, [impoliteness].
discover, v. ascertain, detect, [unearth], descry, [discern], disclose, ferret [out].
discovery, n. ascertainment, detection, unearthing, disclosure.
discredit, n. disesteem, [disrepute], [unpopularity].
discreet, a. [prudent], circumspect, [wary], [judicious].
discretion, n. [prudence], circumspection, wariness; [choice], [liberty], [will]. Antonyms: [indiscretion], imprudence, [compulsion], [constraint], [coercion].
discretional, a. [optional], discretionary, elective. Antonyms: [compulsory], [obligatory].
discriminating, a. [distinguishing], differential, discriminative.
discrimination, n. [difference], [distinction], [discernment], [judgment]. Antonyms: indiscrimination, promiscuity, undiscernment.