American English

Definition of preposterous adjective from the Oxford Advanced American Dictionary



    jump to other results
  1. 1completely unreasonable, especially in a way that is shocking or annoying synonym outrageous These claims are absolutely preposterous! It's preposterous to suggest that everything was her fault!
  2. 2unusual in a silly or shocking way synonym outrageous The band members were famous for their preposterous clothes and haircuts.
jump to other results
adverb a preposterously expensive bottle of wine
See the Oxford Advanced Learner's Dictionary entry: preposterous