words with negative prefixes = not

When adding prefixes il, in, im, and ir, make no change in the base word: illegal, invisible, impossible, irregular. All of the prefixes mean “not.” Vowels before double consonants usually have a short sound. 1.    invisible 2.    illiterate 3.    irregular 4.    irresistible 5.    impossible 6.    informal 7.    illegal 8.    impatient 9.    independent 10.  incorrect 11.  inactive 12.  imperfect 13.  impolite 14.  immature 15.  illogical 16.  indefinite 17.  inappropriate 18.  immobile 19.  irresponsible 20.  inexpensive     Challenge Words 21.  irrelevant 22.  irreparable 23.  intolerant 24.  indisputable 25.  impersonal