Adjectives

(s)downrightcharacterized by plain blunt honesty“a downright answer”, “a downright kind of person”
(s)absolute, downright, out-and-out, rank, right-down, sheercomplete and without restriction or qualification; sometimes used informally as intensifiers“absolute freedom”, “an absolute dimwit”, “a downright lie”, “out-and-out mayhem”, “an out-and-out lie”, “a rank outsider”, “many right-down vices”, “got the job through sheer persistence”, “sheer stupidity”

Adverbs

(r)downright, outrightthoroughgoing“he is outright dishonest”