Single word for "probably wrong"

Question

I need a word that corresponds to the meaning of "probably wrong" (as said in the title). I can re-phrase my sentence, but I would appreciate it if someone knew of an adjective that fits the statement.

Here's an example of what I mean: "In her utter confusion, she scrawled the [probably wrong] answers on the paper."

Answer 1

Takers of multiple choice tests are sometimes advised to “eliminate improbable answers”
(example usage from Barron's Regents Exams and Answers: Earth science-- the physical setting, via GoogleBooks)

improbable
adjective
not likely to be true or to happen; not probable:
an improbable excuse
(from Cambridge Dictionary)

In the third edition (2003) of Webster's New World Thesaurus By Charlton Laird (also via GoogleBooks), this connection is made between “[Improbable] [and] probably wrong” in its second entry for “doubtful.”

Answer 2

Consider sketchy:

1. :of the nature of a sketch :roughly outlined

2. :wanting in completeness, clearness, or substance :slight, superficial 

   • the details are sketchy

3. :questionable, iffy

   • got into a sketchy situation
   • a sketchy character

_{Merriam-Webster}