hard-boiledEnglishOxford American Thesaurushard-boiled adjective informal a hard-boiled undercover agent: cynical, tough, hardened, hard-bitten, hardheaded, callous, as hard as nails, unsentimental, lacking sentiment, world-weary, case-hardened, toughened by experience; informal hard-nosed, as tough as old boots; rare indurate, indurated. ▷antonyms sentimental.
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