Webster's English Dictionary

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erroneous

er.ro.ne.ous \ir-'o--ne--*s, e-'ro--\ aj [ME, fr. L erroneus, fr. erron-, 
   erro wanderer, fr. errare] archaic  1: WANDERING  2: containing or 
   characterized by error : MISTAKEN  - er.ro.ne.ous.ly av