Also found in: Thesaurus, Legal.
1. A thoroughly unprincipled person; a scoundrel.
2. A foul-mouthed person.
tr.v. black·guard·ed, black·guard·ing, black·guards
To abuse verbally; revile.
black′guard·ly adj. & adv.
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|Adj.||1.||blackguardly - lacking principles or scruples; "the rascally rabble"; "the tyranny of a scoundrelly aristocracy" - W.M. Thackaray; "the captain was set adrift by his roguish crew"|