This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Appropriate to a villain, as in wickedness or depravity: a villainous plot.

adj. Being or manifesting the nature of a villain: a villainous band of thieves.

adj. Highly undesirable or offensive; obnoxious.

adj. of, relating to, or appropriate to a villain

adj. obnoxious, offensive or reprehensible in nature or behaviour; nefarious

adj. Base; vile; mean; depraved.

adj. Proceeding from, or showing, extreme depravity; suited to a villain.

adj. Sorry; mean; mischievous; -- in a familiar sense.

Pertaining to, befitting, or having the character of a villain, in any sense; especially, very wicked or depraved; extremely vile.

Proceeding from extreme wickedness or depravity: as, a villainous action.

Of things, very bad; dreadful; mean; vile; wretched.

In a vile manner or way; villainously.

adj. extremely wicked

"Clearly, he considered me to have engaged in villainous practices."

wicked   

criminal    rascally    villainous judgment   

base    vile    mean    depraved    sorry    mischievous    miscreant    ruffian   

dastardly    abominable    vile    fiendish    atrocious    murderous    detestable    nefarious    despicable    cowardly