"Right-down" is an adverb that can also be described as "completely" or "thoroughly". It signifies being direct or straightforward, typically in a blunt way. Synonyms for the phrase include "utterly", "totally", "absolutely", "entirely", "wholly", and "fully". You can use these words to convey the same meaning as "right-down" in a sentence. For example, instead of saying "I told him right-down that he was wrong," you could say "I completely told him that he was wrong." Using synonyms for "right-down" will broaden your vocabulary and can also prevent repetition in your writing and speaking.