flat out wrong

Related

inaccurate · erroneous · bogus · fallacious · flawed · misguided · absurd · nonsense · baloney · hogwash · ridiculous · preposterous · laughable · debunked · baseless · unfounded · lie · fabrication

Opposites
correctness/accuracy

flat out wrongabsolutely right

Entirely correct, no exceptions

spot on · correct · on the mark · true · accurate

degree of certainty in judgment

flat out wrongincontrovertible

Impossible to deny

undeniable · irrefutable · proven · verified

degree of certainty in wrongness

flat out wrongdebatable

Open to question

arguable · in the ballpark

Familiarity
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