Available Definitions:
1) adv. - Straight down; perpendicularly.
2) adv. - In plain terms; without ceremony.
3) adv. - Without delay; at once; completely.
4) a. - Plain; direct; unceremonious; blunt; positive; as, he spoke in his downright way.
5) a. - Open; artless; undisguised; absolute; unmixed; as, downright atheism.