AEE: What Does Preposterous Mean? 1. preposterous 荒谬的 可笑的 negative word, basically mean ridiculous, daily conversation silly, an extream sounding word but you can use it in a playful way, and when use it seriously it can be affensive . exaggerate 使扩大 /夸张 eg, i know my outfits is preposterous, isn't it ? (i wore wrong color) eg, your arguments here is preposterous, you have nothing to back up you claims. eg, this line is preposterous, when will i get more people to start walking at the register . 2. ridiculous 可笑的 荒谬的 eg, the price at that restaurant are ridiculous, let's go somewhere else. 3. insane疯狂的 愚蠢的 荒唐的 eg, this price are insane . should we get to the party at six ? that's ridiculous, you know we have to be fashionably ? late. fine fine but i don't wanna leave during rash hour.高峰期,that it be just illogical 不合逻辑/常理的 yep true, and the trafic is ridiculous at that time.