If you describe something as preposterous, you mean that it is extremely unreasonable and foolish.
例句
The whole idea was preposterous.整个想法都荒唐透顶。...their preposterous claim that they had unearthed a plot.他们无比愚蠢地声称自己发现了一个阴谋
英汉词典释义
adj.
反常的,荒谬的;荒谬可笑的
It is preposterous!岂有此理!It would be preposterous to shovel coal with a teaspoon.用茶匙铲煤 是荒谬的。
英英词典释义
Adjective
1. completely devoid of wisdom or good sense;
"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"