Synonym: betise, folly, foolishness, imbecility. Similar words: cupidity, stupid, avidity, rigidity, validity, lucidity, solidity, humidity. Meaning: [stuː'pɪdətɪ /-tju-] 
n. 1. a poor ability to understand or to profit from experience 2. a stupid mistake.
n. 1. a poor ability to understand or to profit from experience 2. a stupid mistake. 
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1. This is a case of stupidity, not dishonesty.
2. She rebuked herself for her stupidity.
3. What he is doing is utter stupidity!
4. Her answer showed the most incredible stupidity.
5. Conceit is associated with stupidity and ignorance.
6. He cursed himself for his stupidity.
7. It was plain stupidity on Richard's part.
8. That decision was sheer stupidity.
9. I couldn't believe my own stupidity.
10. She was enraged at his stupidity.
11. Through his own stupidity, he missed an excellent opportunity.
12. She rebuked herself sharply for her stupidity.
13. My own stupidity lost me the match.
14. I blushed scarlet at my stupidity.
15. Her stupidity is beyond belief sometimes.
16. His stupidity is past belief.
17. She can't abide coarseness and stupidity.
18. I stared at him,[sentencedict.com/stupidity.html] astonished by his stupidity.
19. I never cease to marvel at his stupidity.
20. She was exasperated at/by his stupidity.
21. She wondered at her own stupidity.
22. It was sheer stupidity to refuse at the price they were offering.
23. He faked stupidity to try to escape punishment for the crime.
24. Is it love of publicity or plain stupidity on her part?
25. A moment's reflection will show the stupidity of this argument.
26. It's the height of stupidity to go out to sea in this bad weather.
27. A blunt knife may be sharpened on a stone, but if a man is stupid there is no help for his stupidity. 
28. Nothing in all the world is more dangerous than sincere ingnorance and conscientious stupidity.
29. It is time someone pointed out to Tom the stupidity of his behavior.
30. I mean, tackling six men single-handedly - that really is the ultimate in stupidity!
More similar words: cupidity, stupid, avidity, rigidity, validity, lucidity, solidity, humidity, placidity, morbidity, hyperacidity, cupid, epididymis, stupor, stupefy, stupefied, stupendous, iditarod, stupefaction, oddity, nudity, heredity, commodity, fecundity, profundity, pupil, supine, lupine, jupiter, marsupial.