Definition of unkindliness in English:

unkindliness

Pronunciation /(ˌ)ʌnˈkʌɪndlɪnɪs/

noun

  • 1The quality or state of being unkindly; lack of kindness or sympathy; unkindness, cold-heartedness.

  • 2With reference to the soil, weather, season, etc.: the quality of being harsh or poor; especially the quality of being unsuitable for the growth of plants or crops.

Origin

Late 15th century (in an earlier sense). From unkindly + -ness, after kindliness.