/prɪˈpɑːstərəs/
pre·pos·ter·ous
BrE /prɪˈpɒstərəs/
NAmE /prɪˈpɑːstərəs/
(formal)
completely unreasonable, especially in a way that is shocking or annoying
SYN outrageous
These claims are absolutely preposterous!
unusual in a silly or shocking way
SYN outrageous
The band were famous for their preposterous clothes and haircuts.
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pre·pos·ter·ous·ly
BrE /prɪˈpɒstərəsli/
NAmE /prɪˈpɑːstərəsli/
a preposterously expensive bottle of wine