If what you tell me is not exactly right, it is inaccurate. If you measured the amount of rainfall incorrectly, your data about the climate would be inaccurate.

Accuracy means being very precise and getting the information right. When something is inaccurate, it is the opposite of exact. If you get a question wrong on a test, your teacher will not say, "You, sir, are inaccurate," she'll just say you are wrong. She might also explain that your inaccurate methodology led to an inaccurate response.

Definitions of inaccurate
  1. adjective
    not exact
    “an inaccurate translation”
    “the thermometer is inaccurate
    away, outside
    (of a baseball pitch) on the far side of home plate from the batter
    faulty, incorrect, wrong
    characterized by errors; not agreeing with a model or not following established rules
    not trustworthy
    wide, wide of the mark
    not on target
    incorrect, wrong
    not correct; not in conformity with fact or truth
    not exact
    not precise
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    conforming exactly or almost exactly to fact or to a standard or performing with total accuracy
    close, faithful
    marked by fidelity to an original
    accurate and to the point
    hi-fi, high-fidelity
    characterized by minimal distortion in sound reproduction
    performed with great precision
    in keeping with the facts
    dead on target, true
    accurately placed or thrown
    right, veracious
    precisely accurate
    correct, right
    free from error; especially conforming to fact or truth
    marked by strict and particular and complete accordance with fact
    sharply exact or accurate or delimited
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