Longman Dictionary of Contemporary English
The Collaborative International Dictionary
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.
hard-boiled \hard-boiled\ adj.
-
same as hard-bitten.
Syn: hard-bitten, pugnacious.
-
emotionally hardened; -- used of persons.
Syn: callous, case-hardened, hardened.
cooked until the yolk is solid; -- used of eggs; as, a breakfast of pancakes and hard-boiled eggs.
Douglas Harper's Etymology Dictionary
Wiktionary
1 (qualifier: of a boiled egg) cooked to a solid consistency. 2 (qualifier: of a person, especially of a detective) callous and unsentimental. alt. 1 (qualifier: of a boiled egg) cooked to a solid consistency. 2 (qualifier: of a person, especially of a detective) callous and unsentimental. v
(en-pasthard-boil)
WordNet
adj. tough and callous by virtue of experience [syn: hard-bitten, pugnacious]
used of persons; emotionally hardened; "faced a case-hardened judge" [syn: case-hardened, hardened]
(used of eggs) cooked until the yolk is solid