C1 English Vocabulary List

idiot noun ignorance noun illegible adjective illicit adjective imagery noun immense adjective imminent adjective implementation noun implicit adjective imprison verb imprisonment noun inability noun inadequate adjective inappropriate adjective incidence noun inclined adjective inclusion noun incur verb indicator noun indictment noun indigenous adjective induce verb indulge verb industrious adjective inequality noun infamous adjective infant noun infect verb inflammable adjective inflict verb influential adjective inherent adjective inhibit verb initiate verb inject verb injection noun injustice noun inmate noun insertion noun insider noun inspect verb inspection noun inspiration noun instinct noun institutional adjective instruct verb instrumental adjective insufficient adjective insult noun insult verb intact adjective intake noun integral adjective integrated adjective integration noun integrity noun intellectual noun intensify verb intensity noun intensive adjective