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immerse (v.) to absorb, deeply involve, engross (After breaking up with her boyfriend, Nancy decided to immerse herself in her work in order to avoid crying.)

immutable (adj.) not changeable (The laws of physics are immutable and constant.)

impassive (adj.) stoic, not susceptible to suffering (Stop being so impassive; it’s healthy to cry every now and then.)

impeccable (adj.) exemplary, flawless (If your grades were as impeccable as your sister’s, then you too would receive a car for a graduation present.)

impecunious (adj.) poor (“I fear he’s too impecunious to take me out tonight,” the bratty girl whined.)

imperative 1. (adj.) necessary, pressing (It is imperative that you have these folders organized by midday.) 2. (n.) a rule, command, or order (Her imperative to have the folders organized by midday was perceived as ridiculous by the others.)

imperious (adj.) commanding, domineering (The imperious nature of your manner led me to dislike you at once.)

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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.)

impervious (adj.) impenetrable, incapable of being affected (Because of their thick layer of fur, many seals are almost impervious to the cold.)

impetuous (adj.) rash; hastily done (Hilda’s hasty slaying of the king was an impetuous, thoughtless action.)

impinge 1. (v.) to impact, affect, make an impression (The hail impinged the roof, leaving large dents.) 2. (v.) to encroach, infringe (I apologize for impinging upon you like this, but I really need to use your bathroom. Now.)

implacable (adj.) incapable of being appeased or mitigated (Watch out: once you shun Grandma’s cooking, she is totally implacable.)

implement 1. (n.) an instrument, utensil, tool (Do you have a knife or some other sort of implement that I could use to pry the lid off of this jar?) 2. (v.) to put into effect, to institute (After the first town curfew failed to stop the graffiti problem, the mayor implemented a new policy to use security cameras to catch perpetrators in the act.)

implicate (v.) to involve in an incriminating way, incriminate (Even though Tom wasn’t present at the time of the shooting, he was implicated by the evidence suggesting that he had supplied the shooters with guns.)

implicit (adj.) understood but not outwardly obvious, implied (I know Professor Smith didn’t actually say not to write from personal experience, but I think such a message was implicit in her instruction to use scholarly sources.)

impregnable (adj.) resistant to capture or penetration (Though the invaders used battering rams, catapults, and rain dances, the fortress proved impregnable and resisted all attacks.)

impudent (adj.) casually rude, insolent, impertinent (The impudent young man looked the princess up and down and told her she was hot even though she hadn’t asked him.)