Glossary entry (derived from question below)
English term or phrase:
Non-regrettable
Portuguese translation:
não reconsiderável/sem possibilidade de reconsideração
English term
United States
Excellence in Language Solutions
Native in: Portuguese (Variant: Brazilian) 
Works in: Portuguese to English, English to Portuguese, Spanish to Portuguese
Non-regrettable
Voluntary + Non-Regrettable + Successor/High Performer OR Critical Role
Thanks for all suggestions!
Proposed translations
Brazil
Business, entertainment & the in between
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese, English, and 1 more.
não reconsiderável/sem possibilidade de reconsideração
| É isso Aline, obrigada!!! |
Brazil
32 years engineering/law/contracts
Native in: English (Variant: US) , Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Portuguese to English
irretratável / irrevogável
Will do!
Native in: Portuguese (Variant: European/Portugal)
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
não indispensável/sem impacto
https://www.proz.com/kudoz/spanish-to-english/human-resource...
Brazil
Expert in language service for HR
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese
favorável
Mesmo sendo termos isolados da pesquisa de mercado em questão, só o tradutor tem em mãos todo o contexto para análise.
Synonyms: unfortunate , deplorable, lamentable, pitiful, unfavorable, shocking , dreadful , upsetting
Brazil
12 years of technical translations
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese
não prejudicial
"Regrettable turnover is when an employee’s departure from a company has a negative impact on the team or organization. Measuring regrettable turnover is a more accurate way to measure turnover to determine an organization’s health."
http://https://www.linkedin.com/pulse/how-determine-regrettable-versus-non-regrettable-cummings/
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