noun (n)

• an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot)(noun.state)

  Synonym:
  callus
  

  source: wordnet30
• devoid of passion or feeling; hardheartedness(noun.attribute)

  Synonym:
  callousness, hardness, insensibility, unfeelingness
  

  source: wordnet30
• A hard or thickened spot or protuberance; a hardening and thickening of the skin or bark of a part, eps. as a result of continued pressure or friction.(noun)

  source: webster1913