First Known Use of thick-skinned
callous, case-hardened, cold-blooded, compassionless, desensitized, hard, hard-boiled, hard-hearted, heartless, indurate, inhuman, inhumane, insensate, insensitive, ironhearted, merciless, obdurate, pitiless, remorseless, ruthless, soulless, stony (also stoney), take-no-prisoners, uncharitable, unfeeling, unmerciful, unsparing, unsympathetic;
THICK-SKINNED Defined for English Language Learners
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