Impenitent

(adj.) without regret, shame, or remorse

1. It was obvious after his impenitent remark to the press that the defendant felt no remorse for his crime.

Imperious

(adj.) arrogant; urgent

1. Her imperious manner cost her her two best friends.
2. It was imperious that the message reach the police chief.

Imperturbable

(adj.) calm; not easily excited

1. The imperturbable West Point graduate made a fine negotiator.

Impervious

(adj.) impenetrable; not allowing anything to pass through; unaffected

1. The vest that the policeman wears is impervious to bullets.
2. The child was impervious to the actions of the adult.

Impetuous

(adj.) moving with great force; done with little thought

1. The impetuous movement took the art community by storm.
2. The impetuous teenager spent her money without considering what she needed the new purchase for.
3. Dagmar came to regret his impetuous actions, once he realized what he'd done.
4. The pirate's men boarded the ship with impetuous matter-of-factness.

Impiety

(n.) irreverence toward God; lack of respect

1. The bishop condemned the impiety of the celebrity's assertions.
2. Impiety is evident in the way many people commit rude actions.

Implacable

(adj.) unwilling to be pacified or appeased

1. The baby was so implacable a warm bottle would not settle her.
2. The two year old was an implacable child; he cried no matter what his parents did to comfort him.

Implement

(v.; n.) to carry into effect; something used in a given activity

1. In case of emergency implement the evacuation plan immediately.
2. The rack is an implement of torture.

Implication

(n.) suggestion; inference

1. An implication was made that there might be trickery involved.

Implicit

(adj.) understood but not plainly stated; without doubt

1. The child's anger was implicit.
2. Implicit trust must be earned.

Impolitic

(adj.) unwise; imprudent

1. If you are planning to invest your money, impolitic decisions may be costly.

Imprecate

(v.) to pray for evil; to invoke a curse

1. A witch may imprecate an enemy with a curse of bad luck.

Impromptu

(adj.) without preparation

1. Her impromptu speech was well-received, giving her new confidence in her ability to speak off the cuff.

Improvident

(adj.) not providing for the future

1. An improvident person may end up destitute in latter life.

Impudent

(adj.) disrespectful and shameless

1. Impudent actions caused him to be unpopular.

Impugn

(v.) to attack with words; to question the truthfulness or integrity

1. The defense lawyer impugned the witness's testimony, which set back the prosecution's case.
2. If I believe the man is a fraud I will impugn his comments.

Imputation

(n.) to charge, to attribute a fault or misconduct to another

1. The imputation of guilt was made by the judge.

Inadvertent

(adj.) not on purpose; unintentional

1. It was an inadvertent error, to be sure, but nonetheless a mistake that required correction.

Inanimate

(adj.) to be dull or spiritless; not animated, not endowed with life

1. The boy nagged his father for a real puppy, not some inanimate stuffed animal.

Inarticulate

(adj.) speechless; unable to speak clearly

1. He was so inarticulate that he had trouble making himself understood.

Inaudible

(adj.) not able to be heard

1. The signals were inaudible when the fans began to cheer.

Incessant

(adj.) constant and unending

1. The mother gave in to the child after her incessant crying.
2. Incessant rain caused the river to flood over its banks.

Inchoate

(adj.) not yet fully formed; rudimentary

1. The inchoate building appeared as if it would be a fast-food restaurant.
2. The outline of the thesis was the inchoate form of a very complex theory.

Incidental

(adj.) extraneous; unexpected

1. The defense lawyer argued that the whereabouts of the defendant's sneakers were only incidental to the commission of the crime.

Incisive

(adj.) getting to the heart of things; to the point

1. His incisive questioning helped settle the matter quickly.

Inclined

(adj.) apt to; likely; angled

1. The man's ear for music indicated he was inclined toward learning an instrument.
2. The hillside was inclined just enough to make for a fairly serious climb.

Incognito

(adj.) unidentified; disguised; concealed

1. The federal Witness Protection Program makes its charges permanently incognito.

Incoherent

(adj.) illogical; rambling; disjointed

1. Following the accident, the woman went into shock and became incoherent as medics struggled to understand her.

Incommodious

(adj.) inconvenient

1. The incommodious illness caused her to miss an important interview.

Incompatible

(adj.) disagreeing; disharmonious not compatible

1. Being incompatible with each other, children were assigned to sit on opposite sides of the room.

Incompetence

(n.) failing to meet necessary requirements

1. The alleged incompetence of the construction crew would later become the subject of a class-action suit.

Inconclusive

(adj.) not final or of a definite result

1. The results being inconclusive, the doctors continued to look for a cause of the illness.

Incorporeal

(adj.) not consisting of matter

1. The apparition appeared to be incorporeal.

Incorrigible

(adj.) not capable of correction or improvement

1. The mischievous boy was an incorrigible practical joker.

Incredulous

(adj.) skeptical

1. The incredulous look on his face led me to believe he was not convinced of its importance.
2. The reporter was incredulous on hearing the computer executive's UFO account.

Inculcate

(v.) to impress upon the mind, as by insistent urging

1. I will inculcate the directions if people are unsure of them.

Incursion

(n.) an entry into, especially when not desired

1. The incursion by enemy forces left the country shocked.

Indecipherable

(adj.) illegible

1. The scribbling on the paper is indecipherable.

Indelible

(adj.) that which cannot be blotted out or erased

1. The photograph of Neil Armstrong setting foot on the moon made an indelible impression on all who saw it.

Indemnify

(v.) to insure against or pay for loss or damage

1. It is important to indemnify your valuables with a reliable insurance company.

Indict

(v.) charge with a crime

1. The grand jury indicted her and her husband for embezzlement and six other lesser counts.

Indifferent

(adj.) unconcerned

1. There he lay, indifferent to all the excitement around him.

Indigence

(n.) the condition of being poor

1. The family's indigence was evident by the run-down house they lived in.

Indigenous

(adj.) native to a region; inborn or innate

1. These plants are indigenous to all of the western states.
2. Piranha are indigenous to the tropics.

Indignant

(adj.) expressing anger to an injustice

1. He was indignant over the way he was treated.

Indolent

(adj.) lazy; inactive

1. If we find him goofing off one more time, we won't be able to escape the fact that he's indolent.
2. An indolent student slept all day.

Indomitable

(adj.) not easily discouraged or defeated

1. The underdog candidate had an indomitable spirit.

Indubitably

(adj.) unquestionably; surely

1. The officer was best indubitably the candidate for captain.

Indulgent

(adj.) lenient; patient; permissive

1. He has indulgent tendencies to eat chocolate when he is happy.

Ineluctable

(adj.) something inevitable

1. They were prepared for the ineluctable disaster.