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erroneous (adj) wrong; mistaken.
Erroneous opinions are wrong or mistaken opinions based on wrong information or wrong assumptions. Erroneous calculations or estimates are wrong calculations and estimates based on wrong data.
- I tried my best to correct his erroneous impression that I was a dodger, but in vain. He was sure that I evaded work.
- The explorers up to the 17th century proceeded on the erroneous assumption that the earth was flat.