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preposterous has 8 distinct synonyms spread across 1 of its 1 sense. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
so unreasonable as to invite derision
“the absurd excuse that the dog ate his homework”
Synonyms, antonyms and the broader and narrower relations for preposterous come from Princeton University’s WordNet. Full sources and licences.