- containing error; mistaken; incorrect; wrong: an erroneous answer.
- straying from what is moral, decent, proper, etc.
- based on or containing error; mistaken; incorrect
late 14c., from Old French erroneus and directly from Latin erroneus “vagrant, wandering” (in Late Latin “erroneous”), from erronem (nominative erro) “vagabond,” from errare “to wander, err” (see err). Related: Erroneously.