blackguardly
Like a scoundrel
Blackguardly describes behavior befitting a blackguard—villainous, scoundrelly, thoroughly dishonorable.
The word is old-fashioned and literary, carrying a theatrical quality: Such blackguardly conduct will not be tolerated.
It suggests not just wrongdoing but a certain shameless audacity in the wrongdoing.
Dishonest, unscrupulous person
- rogueDishonest or uncontrolled agent
- villainWicked story antagonist
- knaveDishonest, unprincipled person
- cadDishonorable man
rascal · dastardly · wicked · nefarious · malevolent · sinister · diabolical · vile
Causing or meriting disgrace
- disgracefulCausing loss of respect
- unprincipledLacking moral standards
- unscrupulousLacking moral principles
- immoralContrary to ethical principles
unethical · disreputable · sordid · scandalous · reprehensible · dishonest · crooked · cowardly
Breaking of trust
- backstabbingCovert betrayal of trust
- double-crossingBetraying someone's trust
- perfidiousDeliberately breaking faith
- duplicitousDeliberately deceptive in nature
traitorous · disloyal · scheming · conniving · two-faced · insidious · sneaky · underhanded
scoundrel
Dishonest, unscrupulous person
- rogueDishonest or uncontrolled agent
- villainWicked story antagonist
- knaveDishonest, unprincipled person
cad · rascal · dastardly · wicked · nefarious · malevolent · sinister · diabolical · vile · heinous
shameful
Causing or meriting disgrace
- disgracefulCausing loss of respect
- unprincipledLacking moral standards
- unscrupulousLacking moral principles
immoral · unethical · disreputable · sordid · scandalous · reprehensible · dishonest · crooked · cowardly · ungentlemanly
betrayal
Breaking of trust
- backstabbingCovert betrayal of trust
- double-crossingBetraying someone's trust
- perfidiousDeliberately breaking faith
duplicitous · traitorous · disloyal · scheming · conniving · two-faced · insidious · sneaky · underhanded · false-hearted
blackguardlygentlemanly
Well-mannered and honorable
chivalrous · gallant · respectable · dignified · courteous