1. 愚蠢：sillimanite 硅线石 | silliness 愚蠢 | silly billy 傻瓜

2. 不正经：5. Blame 怪罪 | 6.Silliness 不正经 | 7.Jokes 逗笑

3. 愚蠢/糊涂：sillimanite /矽线石/ | silliness /愚蠢/糊涂/ | silmanal /银锰铝特种磁性合金/

4. 愚蠢 (名)：sill 基石, 窗台, 门槛 (名) | silliness 愚蠢 (名) | silly 愚蠢的, 失去知觉的, 无聊的 (形)

noun

1. an impulsive scatterbrained manner

Synonym: giddiness

2. a ludicrous folly

e.g. the crowd laughed at the absurdity of the clown's behavior

Synonym: absurdityfatuityfatuousness