Cambridge Advanced Learner's Dictionary
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Definition
preposterous adjective
/prɪˈpɒs.tər.əs/
/-ˈpɑː.stɚ-/ adj formal
/-ˈpɑː.stɚ-/ adj formal very silly or stupid
The very idea is preposterous!
a preposterous suggestion
(Definition of preposterous adjective from the Cambridge Advanced Learner's Dictionary)
