haughty
(adj.) disdainfully proud (The superstar's haughty dismissal of her co-stars will backfire on her someday.)
 
hypocrisy
(n.) pretending to believe what one does not (Once the politician began passing legislation that contradicted his campaign promises, his hypocrisy became apparent.)
 
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.)
 
impertinent
(adj.) rude, insolent (Most of your comments are so impertinent that I don't wish to dignify them with an answer.)
 
implacable
(adj.) incapable of being appeased or mitigated (Watch out: once you shun Grandmother's cooking, she is totally implacable.)
 
impudent
(adj.) casually rude, insolent, impertinent (The impudent young woman looked her teacher up and down and told him he was hot.)
 
incisive
(adj.) clear, sharp, direct (The discussion wasn't going anywhere until her incisive comment allowed everyone to see what the true issues were.)
 
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?)
 
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.)
 
infamy
(n.) notoriety, extreme ill repute (The infamy of his crime will not lessen as time passes.)
 
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.)
 
innate
(adj.) inborn, native, inherent (His incredible athletic talent is innate, he never trains, lifts weights, or practices.)
 
insatiable
(adj.) incapable of being satisfied (My insatiable appetite for blondes was a real problem on my recent holiday in Japan!)
 
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.)
 
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.)
 
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.)