[uh-roh-nee-uhs, e-roh-]
containing error; mistaken; incorrect; wrong: an erroneous answer.
straying from what is moral, decent, proper, etc.

1350–1400; Middle English < Latin errōneus straying, equivalent to errōn- (stem of errō) wanderer (derivative of err-; see err) + -eus -eous

erroneously, adverb
erroneousness, noun
nonerroneous, adjective
nonerroneously, adverb
nonerroneousness, noun

1. inaccurate, untrue, false.

1. accurate. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
erroneous (ɪˈrəʊnɪəs)
based on or containing error; mistaken; incorrect
[C14: (in the sense: deviating from what is right), from Latin errōneus, from errāre to wander]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  erroneous1
Part of Speech:  adj
Definition:  not true, correct, or right; containing an error or errors
Etymology:  Latin errare 'to wander'
Main Entry:  erroneous2
Part of Speech:  adj
Definition:  characterized by error; faulty
Etymology:  Latin errare 'to wander'
Main Entry:  erroneous3
Part of Speech:  adj
Definition:  wandering aimlessly; vagrant
Etymology:  Latin errare 'to wander'
Main Entry:  erroneous4
Part of Speech:  adj
Definition:  straying from a wise or right path
Etymology:  Latin errare 'to wander''s 21st Century Lexicon
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Word Origin & History

c.1400, from L. erroneus "vagrant, wandering," from erronem (nom. erro) "vagabond," from errare "to wander, err" (see err). Related: Erroneously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If erroneous data and theory was used to develop these models, then models are
Relative evaluations on arbitrary criteria and tendencies to impose new value
  systems can be erroneous and damaging.
On second thought, my advice about pop quizzes was erroneous.
More often than not, they reach erroneous conclusions.
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