Incorrect things are wrong or mistaken. Driving the incorrect direction on the highway can be dangerous. Turn around!

Using the incorrect name when you greet someone (or eating your soup with the incorrect spoon at a fancy dinner) can be embarrassing. A doctor giving you the incorrect diagnosis is never good. When something is correct, it's proper, accurate, truthful, or without errors, and you get incorrect by adding the "not" prefix, in-.

Definitions of incorrect
  1. adjective
    not correct; not in conformity with fact or truth
    “an incorrect calculation”
    synonyms: wrong
    not exact
    containing or characterized by error
    based on an incorrect or misleading notion or information
    false, mistaken
    arising from error
    not suitable or right or appropriate
    not in accordance with the fact or reality or actuality
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    correct, right
    free from error; especially conforming to fact or truth
    conforming exactly or almost exactly to fact or to a standard or performing with total accuracy
    accurate, exact, precise
    (of ideas, images, representations, expressions) characterized by perfect conformity to fact or truth ; strictly correct
    letter-perfect, word-perfect
    correct to the last detail; especially being in or following the exact words
    following a correct or logical method
    marked by suitability or rightness or appropriateness
    consistent with fact or reality; not false
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  2. adjective
    not in accord with established usage or procedure
    “it is incorrect for a policeman to accept gifts”
    synonyms: wrong
    not suitable or right or appropriate
  3. adjective
    characterized by errors; not agreeing with a model or not following established rules
    “an incorrect transcription”
    synonyms: faulty, wrong
    not exact
  4. adjective
    (of a word or expression) not agreeing with grammatical principles
    ill-formed, ungrammatical
    not grammatical; not conforming to the rules of grammar or accepted usage
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