The prefixes im- and un- are both negative prefixes in English, but they are used in different circumstances:, Im-, Used before words that start with the letters "m" or "p", such as "impossible" and "impolite". Im- can also mean "not" or "opposite of"., impossible, impatient, impolite, Un-, Used before words that start with any letter, including vowels and consonants, to indicate that the new word is the opposite of the original. For example, "unkind" means "not kind" and "unhappy" means "not happy"., unhappy, unlucky, unafraid, untidy, unkind, unreal, unhealthy, unfair, finger, eyes, brain,

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