Antonyms for Proper

Antonyms starting with letter I

• improper

  correct, conventional, individual
• inappropriate

  correct, suitable
• incorrect

  individual, suitable, mannerly
• inaccurate

  mannerly, conventional, incorrect
• inexact

  mannerly, conventional
• indecent

  polite
• indecorous
• indelicate
• impolite

  polite
• informal
• inapplicable
• inapt
• incongruous
• infelicitous
• imprecise

  conventional, mannerly
• inept
• inadequate
• incompatible
• inapposite
• interdicted
• incapable
• intolerable
• imperfect
• incompetent
• inexpert
• irregular

  wrong