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haughty
(adj.) disdainfully proud (The superstar's haughty dismissal of her co-stars will backfire on her someday.)
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hypocrisy
(n.) pretending to believe what one does not (Once the politician began passing legislation that contradicted his campaign promises, his hypocrisy became apparent.)
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impeccable
(adj.) exemplary, flawless (If your grades were as impeccable as your brother's, then you too would receive a car for a graduation present.)
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impertinent
(adj.) rude, insolent (Most of your comments are so impertinent that I don't wish to dignify them with an answer.)
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implacable
(adj.) incapable of being appeased or mitigated (Watch out: once you shun Grandmother's cooking, she is totally implacable.)
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impudent
(adj.) casually rude, insolent, impertinent (The impudent young woman looked her teacher up and down and told him he was hot.)
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incisive
(adj.) clear, sharp, direct (The discussion wasn't going anywhere until her incisive comment allowed everyone to see what the true issues were.)
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indolent
(adj.) lazy (Why should my indolent children, who can't even pick themselves up off the sofa to pour their own juice, be rewarded with a trip to Burger King?)
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inept
(adj.) not suitable or capable, unqualified (She proved how inept she was when she forgot two orders and spilled a pint of cider in a customer's lap.)
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infamy
(n.) notoriety, extreme ill repute (The infamy of his crime will not lessen as time passes.)
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inhibit
(v.) to prevent, restrain, stop (When I told you I needed the car last night, I certainly never meant to inhibit you from going out.)
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innate
(adj.) inborn, native, inherent (His incredible athletic talent is innate, he never trains, lifts weights, or practices.)
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insatiable
(adj.) incapable of being satisfied (My insatiable appetite for blondes was a real problem on my recent holiday in Japan!)
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insular
(adj.) separated and narrow-minded; tight-knit, closed off (Because of the sensitive nature of their jobs, those who work for MI5 must remain insular and generally only spend time with each other.)
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intrepid
(adj.) brave in the face of danger (After scaling a live volcano prior to its eruption, the explorer was praised for his intrepid attitude.)
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inveterate
(adj.) stubbornly established by habit (I'm the first to admit that I'm an inveterate cider drinker-I drink four pints a day.)