| Term | Definition |
| iconoclastic | attacking cherished traditions |
| idiosyncratic | unusual traits in a person |
| ignominious | shameful |
| imbecility | weakness of mind |
| imbroglio | chaotic or confused or intricate scene |
| immutable | not subject or susceptible to change |
| impasse | a situation wherein it is difficult to proceed ahead,a deadlock |
| impecunious | lacking money,penniless |
| impenitent | unrepentant |
| imperious | to be proud and domineering |
| impetuous | to act without thinking,impulsive |
| implacable | incapable of being pacified |
| impudence | impertinence,insolence |
| incandescent | strikingly bright |
| incantation | singing or chanting of magic spells |
| incarcerate | to imprison |
| inchoate | not fully developed yet,early stage |
| incipient | in an early stage |
| incriminate | to accuse |
| indelible | impossible to remove,erase |
| indict | to charge |
| indigent | poor,destitute,impoverished |
| indubitably | beyond a doubt |
| inebriated | a person who has drunk too much alcohol |
| ineluctable | inevitable , inescapable |
| infraction | violation of law |
| inimitable | matchless |
| iniquitous | wrong,wicked |
| innuendo | insinuation |
| insidious | stealthy,subtle,cunning,or treacherous |
| insouciant | to take a serious issue in a light manner |
| internecine | mutually destructive,struggle within a nation |