hardness

Từ điển Oxford Advanced Learner 8th

hard·ness BrE [hɑːdnəs] ; NAmE [hɑːrdnəs] noun uncountable
•water hardness
•hardness of heart
Main entry: ↑hard_derived

• Từ đồng nghĩa / Synonyms:
  ruggedness, unfeelingness, callousness, callosity, insensibility