| Word |
Definition |
| Immaculate | spotless; flawless; absolutely clean |
| Imminent | likely to occur at any moment; impending; projecting or leaning forward |
| Immobility | state of being immovable |
| Immolate | to offer as a sacrifice |
| Immune | resistant to; free or exempt |
| Immure | to imprison; to shut up in confinement |
| Immutable | unchangeable |
| Impair | to injure; to hurt |
| Impale | to pierce |
| Impalpable | incapable of being perceived by touch; intangible |
| Impartial | not biased; fair |
| Impassable | not able to be traveled or crossed |
| Impasse | a position from which there is no escape; deadlock |
| Impassive | without feeling; imperturbable; stoical |
| Impeach | to charge with crime in office; to indict |
| Impeccable | flawless; faultless |
| Impecunious | without money |
| Impede | to hinder; to block |
| Impediment | hindrance; stumbling-block |
| Impel | to drive or force onward |
| Impending | nearing; approaching |
| Impenitent | not repentant |
| Imperative | absolutely necessary; critically important |
| Imperceptive | unnoticeable; undetectable |
| Imperial | like an emperor; related to an empire |
| Imperious | domineering; haughty |
| Impermeable | impervious; not permitting passage through its substance |
| Impertinent | insolent; rude |
| Imperturbable | calm; placid |
| Impervious | impenetrable; incapable of being damaged or distressed |
| Impetuous | violent; hasty; rash |
| Impetus | moving force; incentive; stimulus |
| Impiety | irreverence; lack of respect for God |
| Impinge | to infringe; to touch; to collide with |
| Impious | irreverent |
| Implacable | incapable of being pacified |
| Implausible | unlikely; unbelievable |
| Implement | to put into effect; to supply with tools |
| Implicate | to incriminate; to show to be involved |
| Implication | something hinted at or suggested |
| Implicit | understood but not stated |
| Implode | to burst inward |
| Implore | to beg |
| Imply | to suggest meaning not expressed; to signify |
| Impolitic | not wise |
| Imponderable | weightless |
| Import | significance |
| Importunate | to beg persistently |
| Imposture | assuming a false identity; masquerade |
| Impotent | weak; ineffective |
| Imprecation | curse |
| Impregnable | invulnerable |
| Impromptu | without previous preparation; off the cuff; on the spur of the moment |
| Impropriety | improperness; unsuitableness |
| Improvident | thriftless |
| Improvise | to compose on the spur of the moment |
| Imprudent | lacking caution; injudicious |
| Impudence | impertinence; insolence |
| Impugn | to dispute or to contradict; to challenge; to gainsay |
| Impuissance | powerlessness; feebleness |
| Impunity | freedom from punishment or harm |
| Impute | to attribute; to ascribe |
| Inadvertently | unintentionally; by oversight; carelessly |
| Inalienable | not to be taken away; nontransferable |
| Inane | silly; senseless |
| Inanimate | lifeless |
| Inarticulate | speechless; producing indistinct speech |
| Inaugurate | to begin formally; to install in office |
| Incandescent | strikingly bright; shining with intense heat |
| Incantation | singing or chanting of magic spells; magical formula |
| Incapacitate | to disable |
| Incarcerate | to imprison |
| Incarnate | embodies in flesh; personified |
| Incarnation | act of assuming a human body |
| Incendiary | arsonist |
| Incense | to enrage; to infuriate |
| Incentive | spur; motive |
| Inception | start; beginning |
| Incessant | uninterrupted; unceasing |
