"unjust wicked," 1670s, from iniquity + -ous. Earlier were iniquous (1650s, from Latin iniquus) and inique (1520s, from French inique). Related: Iniquitously; iniquitousness.
iniquitous deeds
inhume
Inigo
inimical
inimitability
inimitable
iniquitous
iniquity
initial
initialese
initialism
initialize