confidentially

in a manner intended to prevent knowledge or awareness by others he was furious when his friend revealed to others information that he had shared confidentially Synonyms backstage, privately, in camera, intimately, secretlyRelated Words à deux, tête-à-tête; inwardly, sotto voce; offscreen, offstage; clandestinely, collusively, conspiratorially, covertly; furtively, secretively, sneakily, stealthily, surreptitiously, undercover, underground, underhand, underhanded, underhandedlyAntonyms openly, publicly