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say it: pri-PAH-stur-uhs
preposterous is an adjective meaning "so unreasonable as to invite derision". It is pronounced /pɹɪˈpɑstɚəs/ — pri-PAH-stur-uhs. It carries one recorded sense.
so unreasonable as to invite derision
“the absurd excuse that the dog ate his homework”
“that's a cockeyed idea”
“ask a nonsensical question and get a nonsensical answer”
“a contribution so small as to be laughable”
“it is ludicrous to call a cottage a mansion”
“a preposterous attempt to turn back the pages of history”
“her conceited assumption of universal interest in her rather dull children was ridiculous”
Definitions, synonyms and semantic relations for preposterous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.