1. not correct; not in conformity with fact or truth

- an incorrect calculation

Similar word(s): inaccurate, erroneous, fallacious, false, mistaken, improper, false, wrong

2. not in accord with established usage or procedure

- it is incorrect for a policeman to accept gifts

Similar word(s): improper, wrong

3. (of a word or expression) not agreeing with grammatical principles

Similar word(s): ungrammatical

4. characterized by errors; not agreeing with a model or not following established rules

- an incorrect transcription

Similar word(s): inaccurate, faulty, wrong