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Definition of blackguard : 1. A person of stained or low character, esp. one who uses scurrilous language, or treats others with foul abuse; a scoundrel; a rough.
2. A vagrant; a bootblack; a gamin.
3. Scurrilous; abusive; low; worthless; vicious; as, blackguard language.
4. The criminals and vagrants or vagabonds of a town or community, collectively.
5. The scullions and lower menials of a court, or of a nobleman's household, who, in a removal from one residence to another, had charge of the kitchen utensils, and being smutted by them, were jocularly called the " black guard"; also, the servants and hangers- on of an army.
6. To revile or abuse in scurrilous language.

Synonyms:

ill-treat, monster, psycho, cry out, leaper, clapperclaw, cry, detent, despot, laugh at, sadist, weenie, frankfurter, poke fun, wiener, hound dog, cad, beast, outcry, click, shout, shout out, mistreat, ogre, Genghis Khan, andiron, firedog, pawl, guy, hound, squall, frank, dog, ill-use, computer-aided design, scream, exclaim, make fun, call out, ridicule, call, wienerwurst, brute, bounder, step, holler, hot dog, domestic dog, savage, yell, animal, rib, hotdog, frump, misuse, maltreat, dog-iron, jest at, abuse, roast, hollo

bitch, jezebel, hog, pimp, criminal, bad guy, malingerer, villain, rapscallion, pervert, reprobate, traitor, heel, miscreant, degenerate, knave, slattern, pig, shyster, devil, scamp, backslider, rascal, scoundrel, slut, tramp, swine, bastard, rogue, slob, lecher, lowlife

evildoer, scalawag, cheat, trickster, mischief-maker, delinquent, defrauder, swindler, gyp, sneak

Usage examples:

• The man might have been a positive blackguard. - "Winding Paths", Gertrude Page.
• I expect none, but I must and shall tell the blackguard what I think of him." - "The Life of Thomas Wanless, Peasant", Alexander Johnstone Wilson.
• Did ye ever expect to see the day that a ragged poor blackguard like me would dare to say as much to one like you? - "The Fortunes Of Glencore", Charles James Lever.