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Phrase(s): *thick-skinned
Fig. not easily upset or hurt; insensitive. (The opposite of thin-skinned. *Typically: be ~; become ~; grow ~.) • Tom won’t worry about your insults. He’s completely thick-skinned. • Jane’s so thickskinned she didn’t realize Fred was being rude to her.
McGrawhill's American Idioms And Phrasal Verbs