stupid and silly behaviour

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stupidity

stupidity [noun]

the state of being silly or unwise

US

/stuːˈpɪd.ə.t̬i/

UK

/stjuːˈpɪd.ə.ti/

Example:

Her stupidity is beyond belief sometimes.

Longman Dictionary of Contemporary English

stupidity

stu‧pid‧i‧ty /stjuːˈpɪdəti, stjuːˈpɪdɪti $ stuː-/ BrE AmE noun (plural stupidities)
[Word Family: noun: ↑stupidity, ↑stupid; adverb: ↑stupidly; adjective: ↑stupid]
1. [uncountable and countable] behaviour or actions that show a lack of good sense or good judgment:
all the horrors and stupidities of war
2. [uncountable] the quality of being stupid

Oxford Advanced Learner's Dictionary

stupidity

stu·pid·ity [stupidity stupidities] [stjuːˈpɪdəti] [stuːˈpɪdəti] noun (pl. stu·pid·ities)
1. uncountable, countable, usually plural behaviour that shows a lack of thought or good judgement
• I couldn't believe my own stupidity.
• the errors and stupidities of youth

• The police were astonished at the sheer stupidity of drivers in going so fast in the fog.

2. uncountable the state or quality of being slow to learn and not clever or intelligent
• He faked stupidity to try to escape punishment for the crime.
Example Bank:
• Her answer showed the most incredible stupidity.
• I can't believe the stupidity of some people.
• I now realize the stupidity of that statement.
• It was sheer stupidity on the part of the crew.
• It's hard to know if it's corruption or just plain stupidity by the authorities.
• Through his own stupidity, he missed an excellent opportunity.
• I couldn't believe my own stupidity.

• The police were astonished at the sheer stupidity of drivers going so fast in the fog.

Cambridge Advanced Learner's Dictionary

Cambridge Advanced Learner's Dictionary - 4th Edition

stupidity / stjuːˈpɪd.ɪ.ti / / stuːˈpɪd.ə.t̬i / noun [ U ]

C2 the state of being silly or unwise:

a moment/act of stupidity

Her stupidity is beyond belief sometimes.

It was sheer stupidity to refuse at the price they were offering.

Collins COBUILD Advanced Learner’s English Dictionary

• stu‧pid‧ity (stupidities)
I stared at him, astonished by his stupidity.
N-VAR: usu with poss

Merriam-Webster's Advanced Learner's Dictionary

Merriam-Webster's Advanced Learner's Dictionary:

stupidity

stu·pid·i·ty /stʊˈpɪdəti, Brit stjʊˈpɪdəti/ noun, pl -ties
1 [noncount] : the state of being foolish or unintelligent : the condition of being stupid
• I was shocked by the stupidity of their decision/behavior.
2 [count] : a stupid idea or action - usually plural
• the stupidities of war