Synonyms of nefarious

adjectiveSinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such...

• evil
• iniquitousMorally objectionable; sinful, wicked.
• sinisterEvil or seemingly evil; indicating lurking danger or harm.
• underhanded
• vile
• good-for-nothingUseless; worthless.
• abandonedHaving given oneself up to vice; immoral; extremely wicked, or sinning without restraint; irreclaimably wicked.
• badEvil; wicked.
• bad appleA person who is not wholesome, honest, or trustworthy, especially one who has an adverse influence on others.
• bad seed
• baleful
• scurrilous
• baneful
• baseMorally reprehensible, immoral; cowardly.
• black-heartedHaving a wicked, malignant disposition; morally bad.
• darkWithout moral or spiritual light; sinister, malevolent, malign.
• deleterious
• demonicExtremely cruel or evil; abhorrent or repugnant; diabolical.
• depraved
• despicableFit or deserving to be despised; contemptible; mean.
• detrimentalCausing damage or harm.
• devilishEvil, wicked.
• diabolicalExtremely wicked or cruel.
• evil-mindedHaving evil thoughts or intentions.
• flagitious literaryExtremely brutal or wicked; heinous, monstrous.
• harmfulCausing or likely to cause harm or damage; injurious.
• heinous
• ill-intentionedHaving bad intentions; malevolent.
• ill-natured
• immoralBreaching principles of natural law, rectitude, or justice, and so inconsistent with the demands of virtue, purity, or...
• incorrigible
• injurious
• knavishHaving the characteristics of a knave; mischievous, roguish, waggish, rascally or impertinent.
• maleficHaving an evil or harmful influence; baleful.
• maleficentHarmful or evil in intent or effect.
• malevolentHaving or displaying ill will; wishing harm on others.
• maliciousIntending to do harm; characterized by spite and malice.
• malign
• malignant
• no-goodHaving no value, use or merit.
• peccaminousSinful.
• pernicious
• reprehensible
• reprobate
• satanicEvil, fiendish, devilish or diabolical.
• scathful
• sinfulConstituting a sin; morally or religiously wrong; wicked; evil.
• sordid
• ungodlyImmoral, sinful, or wicked.
• unholy
• vicious
• villainousWicked, offensive, or reprehensible in nature or behaviour; nefarious.
• wickedEvil or mischievous by nature; morally reprehensible.
• wrong
• disreputableNot respectable, lacking repute; discreditable.
• ill-famedHaving a bad reputation.
• infamousHaving a bad reputation; disreputable; notorious; unpleasant or evil; widely known, especially for something scornful.
• notorious
• arrant datedVery bad; despicable.
• facinorous archaicExtremely wicked.
• iniquous obsoleteSynonym of iniquitous.
• naughty archaic, rareEvil, wicked, morally reprehensible.
• niddering archaicSynonym of nithing (“cowardly, dastardly; notoriously evil or wicked; infamous”).
• nidering archaic
• niding archaic
• nithing archaicNotoriously evil or wicked; infamous.
• sullen obsoleteMischievous; malignant; unpropitious.