right-down vs downright

right-down and downright both are adjectives.

Word	Noun	Adjective	Verb	Adverb
right-down	No	Yes	No	Yes
downright	No	Yes	No	Yes

As adjectives, right-down and downright are synonyms defined as:

right-down and downright: complete and without restriction or qualification; sometimes used informally as intensifiers

Other synonyms of right-down include absolute, out-and-out, rank, sheer.

right-down (adjective)	downright (adjective)
complete and without restriction or qualification; sometimes used informally as intensifiers	complete and without restriction or qualification; sometimes used informally as intensifiers
	characterized by plain blunt honesty

right-down (adverb)	downright (adverb)
positively	thoroughgoing