misconclusion
malobservation
misimplication
misinference
misassumption
false step
misreckoning
miscatch
misimputation
misclaim
misallegation
misprediction
misderive
erroneously
put two and two together and make five
under the impression
misprove
misconjecture
thonk
misappraisal
misexpound
all hollow
misinterpretation
mistakenly
false belief
fallacy
misfigure
idolum
absurdum
fudge
clear up
misapprehend
misprobe
misrelate
misexplicate
miscalculation
thinko
miscomprehend
erroneity
misstatement
inaccurate
misinfer
solecism
obversion
miscluster
wrongly
misconceive
misanalysis
misknow
misconstrue