The prefix in-² occurs in Latin loanwords and attaches to Latinate bases. The bases of most words prefixed with in-² are independent adjectives (inadvertent, incognizant), although the base adjective may no longer be in widespread use (as with incessant ). Exceptions include iniquitous and indignant . -in² has multiple forms, as the 'n' sound in in-² assimilates to the initial sound of the base to which it is attached. See the assimilated forms ig-, il-², im-², and ir-².