Glossary entry (derived from question below)
Portuguese term or phrase:
que morava no mais impracticável beco da terra
English translation:
who inhabited the most indecorous alley thereabouts
Portuguese term
United States
Laudable Lady Linguist
Native in: English 
Works in: Spanish to English, French to English, English to Spanish, and 3 more.
que morava no mais impracticável beco da terra
Foi Simão Botelho cautelosamente hospedado, e o arreeiro abalou no mesmo ponto para Viseu, com una carta destinada a uma mendiga, que morava no mais impracticável beco da terra.
Muita Obrigada,
Barbara
Jul 1, 2021 08:40: Nick Taylor Created KOG entry
Proposed translations
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
who inhabited the most indecorous alley thereabouts
Don't really know what style you are looking for, but I think this retains the metre of the original which is, obviously, somewhat archaic and poetic.
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Mark Robertson
: Resided in, instead of inhabited, perhaps?
15 hrs
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Cheers Mark, I was juggling with that :-)
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Bett
: good
1 day 29 mins
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Thanks Bett
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United States
Versed in English, Portuguese, Spanish
Native in: Portuguese (Variants: Brazilian, European/Portugal) 
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese
Who lived in the least inhabitable alley on Earth.
United Kingdom
WorldWideWords
Native in: English (Variant: UK)
Works in: French to English, Spanish to English, Portuguese to English
who lived in the most godforsaken hellhole...
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Note added at 39 mins (2021-06-17 15:03:12 GMT)
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Or who lived in the back of beyond.
Canada
Accuracy and A1 presentation
Native in: Hungarian , English (Variant: US)
Works in: English to Portuguese, Portuguese to English, Hungarian to English, and 13 more.
who lived in the most ignominious neck of the woods on earth
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Patricia Fierro, M. Sc.
17 mins
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Thank you, Patricia!
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Bett
: good
1 day 4 hrs
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Thanks, Bett!
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Brazil
Translations in marketing and gaming
Native in: Portuguese (Variant: Brazilian) , English (Variant: US)
Works in: English to Portuguese, Portuguese to English, English, and 1 more.
who lived in the most unreasonable ends of the Earth
United States
BA in Transl., MA in ESL, 15 yrs of exp.
Native in: Portuguese
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 2 more.
who lived in the most impassable, dingy alley on Earth
impracticável: Onde não se pode passar. = INTRANSITÁVEL ≠ TRANSITÁVEL
https://dicionario.priberam.org/impraticável
beco: (1) Rua escura, estreita e curta, e às vezes sem saída. (2) Rua sem saída
https://dicionario.priberam.org/beco
The use of "impracticável" may or may not indicate that it was a dead end, or it could be that the street was too narrow.
The addition of "dingy" reinforces something as being small, insignificant. Clearly, his idea of the place was not very positive!
terra: Planeta habitado pelo homem. (If capitalized, it means "world".)
https://dicionario.priberam.org/terra
Most likely, he means planet Earth, since it's not capitalized.
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Note added at 3 hrs (2021-06-17 18:07:19 GMT)
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Example Sentences
impassable street: https://www.google.com/search?q="impassable street"
impassable alley: https://www.google.com/search?q="impassable alley"
PS: Due to my busy schedule, I won't be able to follow up on upcoming peer comments and/or discussions. The Asker is welcome to contact me (via inbox) if any clarification is needed. Thank you.
Brazil
Certified PRO, med, edu, travel
Native in: Portuguese (Variants: Brazilian, European/Portugal)
Works in: English to Portuguese, Portuguese, Portuguese to English
who dwelled in the least passable alley in the land
na terra = does it mean the country/kingdom, or on earth?
Discussion
who resided in the most uninhabiable alley thereabouts
Publisher : Gavea - Brown (January 1, 2000)
Language : English
Paperback : 165 pages
ISBN-10 : 0943722276
ISBN-13 : 978-0943722276