Meaning

adjective characterized by plain blunt honesty

adjective complete and without restriction or qualification; sometimes used informally as intensifiers

adverb thoroughgoing

originThe adverb is derived from Middle English dounright, dounriȝt (“right down, straight down; face down; vertically; used for emphasis: outright, downright”), and then either: * possibly an aphetic form of adounright (“straight down; directly, immediately (?)”), from adoun (“downward”, adverb) (from Old English adūn, adūne (“down, downward”, adverb), ultimately from dūn (“hill, mountain”), from…

Etymology from Wiktionary, CC BY-SA 3.0