In movies, TV shows, and other forms of entertainment, there are often good guys and bad guys. A blackguard is a bad guy. Blackguards are up to no good.

Originally, a blackguard was a type of servant dressed in black, but the meaning evolved to mean a person who is villainous at heart. This is definitely an old-fashioned word you're most likely to see in an older story or play. A blackguard likely won't be guarding anything, but they probably will be doing something evil.

Definitions of blackguard
  1. noun
    someone who is morally reprehensible
    synonyms: bounder, cad, dog, heel, hound
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    type of:
    scoundrel, villain
    a wicked or evil person; someone who does evil deliberately
  2. verb
    use foul or abusive language towards
    synonyms: abuse, clapperclaw, shout
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    abuse with coarse language
    rail, revile, vilify, vituperate
    spread negative information about
    heap obscenities upon
    type of:
    assail, assault, attack, lash out, round, snipe
    attack in speech or writing
  3. verb
    subject to laughter or ridicule
    synonyms: guy, jest at, laugh at, make fun, poke fun, rib, ridicule, roast
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    mock or make fun of playfully
    lampoon, satirise, satirize
    ridicule with satire
    debunk, expose
    expose while ridiculing; especially of pretentious or false claims and ideas
    cause to appear foolish
    uncloak, unmask
    reveal the true nature of
    type of:
    bemock, mock
    treat with contempt
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