Synonyms of the word 
THICK-SKINNED → INSENSITIVE - TOUGH-SKINNED
thick-skinned
- adj. Having a thick skin.
- adj. Not easily offended.
- adj. Insensitive to the feelings of others; callous.
insensitive
- adj. Not expressing normal physical feeling.
- adj. Not expressing normal emotional feelings; cold; tactless; undiplomatic.
tough-skinned
- adj. Resilient; able to endure hardship or criticism, with no apparent adverse effects.
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