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.
behavior typical of a blackguard, characterized by use of obscene language and by roguish actions. — blackguardery, n. — blackguardly, adj.See also: Behavior