inconstancy — English Dictionary

Noun

1. Lack of constancy; lack of consistency in thought, emotion or action.

   Usage

   • Countable
   • Uncountable

   Examples

   Although she loved him for many years, his inconstancy eventually drove her to another.

   More examples (1)

   '[…] But can we wonder that with such a husband to provoke inconstancy, and without a friend to advise or restrain her, (for my father lived only a few months after their marriage, and I was with my regiment in the East Indies), she should fall? […]'

Noun

1. unfaithfulness by virtue of being unreliable or treacherous

   Synonyms

   faithlessnessfalsenessfickleness

   Broader terms

   infidelityunfaithfulness

2. the quality of being changeable and variable

   Synonyms

   changefulness

   Antonyms

   constancy

   Broader terms

   changeablenesschangeability