nefarious

As an adjective nefarious

is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics.

As a noun villain is

(en) a vile, wicked person.

As a verb villain is

(obsolete|transitive) to debase; to degrade.

Unpleasant is a related term of nefarious.

As adjectives the difference between unpleasant and nefarious

is that unpleasant is not pleasant while nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics.

Nefarious is a related term of obnoxious.

As adjectives the difference between nefarious and obnoxious

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while obnoxious is extremely unpleasant, offensive, very annoying, odious or contemptible.

Nefarious is a related term of merciless.

As adjectives the difference between nefarious and merciless

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while merciless is showing no mercy; cruel and pitiless.

Nefarious is a related term of wily.

As adjectives the difference between nefarious and wily

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while wily is sly, cunning, full of tricks.

As adjectives the difference between nefarious and odious

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while odious is arousing or meriting strong dislike, aversion, or intense displeasure.

Nefarious is a related term of infernal.

As adjectives the difference between nefarious and infernal

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while infernal is of or relating to hell, or the world of the dead; hellish.

As a noun infernal is

(obsolete) an inhabitant of the infernal regions.

Nefarious is a related term of coarse.

As adjectives the difference between nefarious and coarse

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while coarse is composed of large parts or particles; of inferior quality or appearance; not fine in material or close in texture.

Nefarious is a synonym of unmentionable.

As adjectives the difference between nefarious and unmentionable

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while unmentionable is not mentionable.

Nefarious is a related term of barbarous.

As adjectives the difference between nefarious and barbarous

is that nefarious is sinful, villainous, criminal, or wicked, especially when noteworthy or notorious for such characteristics while barbarous is not classical or pure.