erroneous

adjective /ɪˈrəʊniəs/
  1. not correct; based on wrong information
    • erroneous conclusions/assumptions
    • He seems to be under the erroneous impression that she is in love with him.
    • The theory is based on several erroneous beliefs.
    • Their conclusions are quite erroneous.
Origin: late Middle English: from Latin erroneus (from erro(n-) ‘vagabond’, from errare ‘to stray, err’) + -ous.

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