Spanish term
Argentina
Multilingual Experts
Native in: English (Variants: UK, US, Canadian) 
Works in: English, Spanish to English, English to Spanish, and 12 more.
Ni un burro tiene el descaro tuyo.
Proposed translations
worked for int. orgs (IMF, OAS, IDB)
Native in: English
Works in: Spanish to English, German to English
You've got some f..king nerve
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Note added at 9 hrs (2020-09-02 03:53:02 GMT)
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Have audacity, show effrontery. For example, You have a nerve telling me what to do, or She had some nerve, criticizing the people who donated their time. The related have the nerve is used with an infinitive, as in He had the nerve to scold his boss in public.
United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
even a moron doesn't show the stupidity that you do
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Note added at 20 mins (2020-09-01 18:29:56 GMT)
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"doesn't show the in-your-face disrespect that you do"
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Note added at 29 mins (2020-09-01 18:38:23 GMT)
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"Not even a moron is as in-your-face asinine as you are."
| neutral |
ormiston
: Hardly idiomatic //an actor has to say it!
1 day 19 hrs
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So what? No reason it has to be. And what about the other options I offered?/An actor could say anything I have proposed. Have a nice evening,
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United States
Native in: Spanish (Variant: Colombian)
Works in: English to Spanish, Spanish to English
Not even a donkey has your nerve.
not even a brass monkey is as brazen as you/
You are bolder / more brazen than brass.
You've got more cheek than a baboon's arse
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Note added at 2 hrs (2020-09-01 20:19:05 GMT)
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Or, you've got more nerve than a toothache....
| agree |
Muriel Vasconcellos
: Nice!
5 mins
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Thanks Muriel
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| agree |
Jean Shearer
: Very appropriate!!
26 mins
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Thanks Jean
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United States
Each translation a gem!
Native in: English (Variant: US)
Works in: Spanish to English, Portuguese to English
You put a jackass to shame
Argentina
Translator and Editor
Native in: Spanish
Works in: English to Spanish, Spanish to English
Not even a stupid dared as you did
Argentina
EN-ES
Native in: Spanish (Variants: Latin American, Rioplatense, Standard-Spain, Argentine)
Works in: English to Spanish, Spanish to English, Portuguese to Spanish
What a nerve!
What a nerve you've got—how dare you suggest something so horrible!
You shameless swine
If a woman catches her husband with another woman, she doesn't accuse him of being 'cheeky'. It's more serious than that, a lot.
And 'descarado' is more than cheeky, anyway, which is almost affectionate.
Descarado's like sinverguenza.
But, as Robert says, exactly what she would say in English would depend on her age, social class, temperament etc.
Discussion
Which English variant are you looking for?
Wouldn't your translation depend on the character's age group, socioeconomic context, etc.?