ridiculously
Many people find the language preposterously complex.
The prosecution are preposterously claiming that he inflicted these injuries on himself.
She hopes to be a millionaire by the age of 18, which seems preposterously unrealistic.
This would mean, preposterously, that when the economy is growing, he would aim to increase borrowing.

SMART Vocabulary: related words and phrases

Stupid and silly
absurd
absurdity
absurdly
adolescent
against your better judgmentidiom
dopey
dopily
dorky
dottiness
dotty
imprudently
in his/her/their wisdomidiom
in someone's infinite wisdomidiom
inadvisable
injudicious
uncritical
uncritically
undiscriminating
unintelligent
unperceptive