'hard-bitten' definitions:

Definition of 'hard-bitten'

From: WordNet
adjective
Tough and callous by virtue of experience [syn: hard- bitten, hard-boiled, pugnacious]

Definition of 'hard-bitten'

From: GCIDE
  • hard-bitten \hard-bitten\ hard-boiled \hard-boiled\adj. not given to sentimentality or gentleness; -- of people; as, a hard-bitten character.
  • Syn: pugnacious, tough. [WordNet 1.5 +PJC]