IM-
rudeness or not following the conventions of being nice to people (n.)
Impoliteness
slightly angry or bothered about something (adj.)
Irritated
to not comprehend something correctly (v.)
Misunderstand
strange or extraordinary (adj.)
Unusual
not truthful (adj.)
Dishonest
Not able to be done or achieved (adj.)
Impossible
not thinking clearly or being logical (adj.)
Irrational
when something is said incorrectly (n.)
Mispronunciation
not having arranged or considered something in advance (adj.)
Unprepared
to not do as you are told (v.)
Disobey
a flaw or fault, or when something is not 100% correct or working properly (n.)
Imperfection
having no importance (adj.)
Irrelevant
To put something in the wrong location or not where it does not belong (v.)
Misplace
without luck or with regret (adv.)
Unfortunately
to demonstrate that, e.g. a theory or conclusion, is false (v.)
Disprove
not yet ready, still young, or not proven (adj.)
Immature
something that happens without expectation or explanation; an anomaly (n.)
Irregularity
Bad luck (n.)
Misfortune
always winning and cannot be defeated (adj.)
Unbeatable
the feeling of a little bit of pain or physical or emotional unpleasantness (n.)
Discomfort
impossible to assign a numerical value to, or unable to be assessed against any criteria (adj.)
Immeasurable
something that causes an uncontrollable attraction (adj.)
Irresistible
to confuse or deceive through ambiguous or false statements or actions (v.)
Mislead
cannot be misunderstood, has no grey areas and is completely clear (adj.)
Unambiguous
being unbiased or objective about something (adj.)
Disinterested