Verbs don't describe, they are doing words... adjectives are used to describe things. It depends what sort of thing you are looking for but you could use words like evil, nasty, cruel, horrid, etc.
adjective form of villain is "Villainous"
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Rather than quote verbatim, I'll err on the side of caution and simply direct you to my preferred on-line vocabulary information source Merriam-Webster.
For vocabulary questions, Merriam-Webster is an excellent resource I use frequently; the search box presents possible word selections as one types, which is often enough to direct the inquirer (or even provide the answer, if spelling was the heart of the question).
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bad guy, evil guy,dark guy, criminal, enemy, antagonist,
No. Villain is a noun, as is villainy. The adjective is villainous.
A villain can be described as criminal, evil, destructive, antisocial, perhaps misguided, dangerous, bad.
my bum in a matter of fact loser
You could say devilish.
Heroic
Yes, arch can be an adjective, meaning either principal or mischievous. Examples : an arch foe, an arch glance (It may be a prefix, or hyphenated form, in words such as archbishop, archrival or arch-villain)
The adjective form is patient.
The adjective form is comedic.
The adjective form is kingly.
The adjective form is familiar.
The possessive form of the noun 'villain' is villain's.Example: The jury didn't believe the villain's claim of innocence.
Yes, arch can be an adjective, meaning either principal or mischievous. Examples : an arch foe, an arch glance (It may be a prefix, or hyphenated form, in words such as archbishop, archrival or arch-villain)
The correct spelling of the adjective is infamous(notorious, as an infamous villain).
The adjective form of concept is conceptual.The adjective form of conception is conceptional.
The adjective form for the pronoun they is their.
The Adjective form of Pathologist is Pathological.
The adjective form of concept is conceptual.The adjective form of conception is conceptional.
The adjective form of improve is "improved."
The adjective form of retire is :- retired, retiring.
adjective form of pass.
The adjective form is decisive.
The adjective form is patient.