Origin: Germanic Old English suffix
Downright has 5 different meanings across 2 categories:
complete 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"
Directed vertically; coming straight down.
"The rain was pouring downright from the sky, soaking through my umbrella in seconds."
Really; actually; quite
"The traffic was downright unbearable during the holiday rush."