Usually means: Extremely strong, resilient, and determined.
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We found 4 dictionaries that define the word tough as nails:

General (2 matching dictionaries)
  1. tough as nails: Merriam-Webster
  2. tough as nails: Wiktionary

Miscellaneous (1 matching dictionary)
  1. tough as nails: Idioms

Slang (1 matching dictionary)
  1. Tough As Nails: Urban Dictionary

Definitions from Wiktionary (tough as nails)

adjective:  (idiomatic, simile) Having a hard, strong, and determined mindset.
adjective:  (simile) Very hard; tough

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