silly (adj.)

古英语 gesælig "快乐的、偶然的、繁荣的"(与 sæl "幸福"有关),来自于原日耳曼语 *sæligas (也是古北欧语 sæll "快乐"、古撒克逊语 salig 、中荷兰语 salich 、古高德语 salig 、德语 selig "幸福的、快乐的、幸福的"、哥特语 sels "好的、善良的"的来源)。

This is one of the few instances in which an original long e ( ee ) has become shortened to i . The same change occurs in breeches , and in the American pronunciation of been , with no change in spelling. [Century Dictionary]

这个词的意义发展相当大,从"快乐"到"幸福"到"虔诚",到"无辜"(13世纪),到"无害",到"可怜"(13世纪末),到"软弱"(14世纪),再到"心灵脆弱,缺乏理智,愚蠢"(1570年代)。在 knocked silly,Silly season 新闻俚语中进一步趋向于"惊呆了,像被打击了一样晕眩"(1886年)。新闻俚语中 从1861年开始(8月和9月,报纸用琐碎的故事来弥补硬新闻的不足)。 Silly Putty 商标主张从1949年7月开始使用。

It is a widespread phenomenon that the words for 'innocent', apart from their legal use, develop, through 'harmless, guileless', a disparaging sense 'credulous, naive, simple, foolish.' [Buck]

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Definitions of silly from WordNet
silly (adj.)
ludicrous, foolish;
a silly idea
Synonyms: goofy / wacky / whacky / zany
silly (adj.)
lacking seriousness; given to frivolity;
silly giggles
Synonyms: airheaded / dizzy / empty-headed / featherbrained / giddy / light-headed / lightheaded
silly (adj.)
inspiring scornful pity; "how silly an ardent and unsuccessful wooer can be especially if he is getting on in years"- Dashiell Hammett;
Synonyms: pathetic / ridiculous
silly (adj.)
dazed from or as if from repeated blows;
knocked silly by the impact
Synonyms: punch-drunk / slaphappy
silly (n.)
a word used for misbehaving children;
don't be a silly