erroneous (adj)

The child held the erroneous belief that time machines were real.
The erroneous information in the report led to confusion among the team members.
The student received a lower grade due to the inclusion of erroneous data in the research paper.
The automated system flagged the transaction as erroneous, prompting a manual review by the finance department.
The erroneous assumptions made during the project planning phase resulted in unexpected delays and setbacks.