Root List - I

1. IN, IG, IL, IM, IR - Not.
Incorrigible, Indefatigable, Indelible, Indubitable, Inept, Inert, Inexorable, Insatiable, Insentinent, Insolvent, Insomnia, Interminable, Intractable, Incessant, Inextricable, Infallible, Infamy, Innumerable, Inoperable, Insipid, Intemperate, Intrepid, Inviolable, Ignorant, Ignominious, Ignoble, Illicit, Illiminable, Immaculate, Immutable, Impasse, Impeccable, Impecunious, Impertinent, Implacable, Impotent, Impregnable, Improvident, Impassioned, Impervious, Irregular, Invade, Inaugurate, Incandescent, Incarcerate, Incense, Indenture, Induct, Ingratiate, Introvert, Incarnate, Inception, Incisive, Infer.

2. IN, IL, IM, IR - In, On, Into.
Infusion, Ingress, Innate, Inquest, Inscribe, Insinuate, Inter, Illustrate, Imbue, Immerse, Implicate, Irrigate, Irritate.

3. INTER - Between, Among.
Intercede, Intercept, Interdiction, Interject, Interlocutor, Interloper, Intermediary, Intermittent, Interpolate, Interpose, Interregnum, Interrogate, Intersect, Intervene.

4. INTRA, INTR - Within.
Intrastate, Intravenous, Intramural, Intrinsic.

5. IT, ITER - Between, Among.
Transit, Itinerant, Reiterate, Transitory.