non compos mentis/ˌnon kompos ʹmentis/ adj

• inconsistent
• inconsolable
• inconsonant
• in consort
• inconspicuous
• inconstant
• in contention
• incontestable
• incontinent
• in contradistinction to
• in contravention of
• in control
• incontrovertible
• inconvenience
• inconvenient
• in convoy
• incoordination
• incorporate
• incorporated
• incorporeal
• incorrect
• incorrigible
• incorruptible
• increase
• incredible