Iniquitous is a related term of villainous.
As adjectives the difference between iniquitous and villainous
is that iniquitous is wicked or sinful while villainous is of, relating to, or appropriate to a villain.
iniquitous
English
Adjective
(
en adjective)
wicked or sinful
morally objectionable
Synonyms
* (wicked :) flagitious
* (wicked :) nefarious
* (morally objectionable :) perverse
Antonyms
* (wicked :) righteous
* (morally objectionable :) righteous
villainous
English
Adjective
(
en adjective)
of, relating to, or appropriate to a villain
obnoxious, offensive or reprehensible in nature or behaviour; nefarious