1. Having a relatively tough outer covering 
2. Insensitive to criticism
   - thick-skinned

See also: insensitive, tough

• Sexagesima
• sexagesimal
• sexcapade
• sexed
• sexily
• sexiness
• sexism
• sexist
• sexless
• sexlessness
• sexologist
• sexology
• sexploitation
• sexpot
• sext
• sextant
• sextet
• sextette
• sextile
• sextillion
• sextodecimo
• sexton
• sextuple
• sextuplet
• sexual