How to say "stupidity, foolishness" in Russian?

Глупость

"stupidity, foolishness" is Глупость in Russian.

Глупость means "stupidity, foolishness" in English.

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Word #2069 of 4,000 by frequency in Russian — level B2.

Example

Я совершил глупость, доверившись незнакомцу.

I made a foolish mistake by trusting a stranger.