misconceived
Definitions
Incorrectly interpreted or understood.
Planned or conceived poorly or based on faulty reasoning.
Examples
The project failed because it was based on a fundamentally misconceived strategy.
Many people hold a misconceived notion that success is solely the result of luck.
Synonyms
misunderstood mistaken ill-conceived misguided erroneous flawed wrongheaded
Antonyms
well-conceived sound logical accurate sensible well-planned correct