dyed-in-the-wool
US /ˌdaɪd.ɪn.ðəˈwʊl/
UK /ˌdaɪd.ɪn.ðəˈwʊl/

1.
convicto, arraigado, de carteirinha
having very strong beliefs, opinions, or habits that are not likely to change
:
•
He's a dyed-in-the-wool conservative.
Ele é um conservador convicto.
•
She's a dyed-in-the-wool optimist, always seeing the bright side.
Ela é uma otimista convicta, sempre vendo o lado bom.