tough as nails
сталевий
неприличный
hartgesotten, eingefleischt
Having a hard, strong, and determined mindsetHaving a hard, strong, and determined mindset.
Meaning
2 senses(idiomatic, not comparable)Having a hard, strong, and determined mindset.
Near-synonyms: hardcore, diehard, steely-spined, steely-nerved, steely-eyed, steely, flinty
(not comparable)Very tough.