constancy

Noun

1. The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc.
   • A little Water cleares vs of this deed. How eaſie is it then? your Conſtancie Hath left you vnattended. - c. 1606 (date written), William Shakespeare, “The Tragedie of Macbeth”, in Mr. William Shakespeares Comedies,...
   • Punctuality is a species of Constancy, a very unfashionable quality in a Lady. - 1777, Richard Brinsley Sheridan, The School for Scandal, IV.iii:
   • And, I do not know that I should be fond of preaching often; now and then, perhaps, once or twice in the spring, after being anxiously expected for half a dozen Sundays together; but not for a constancy; it would not do...
2. An unchanging quality or characteristic of a person or thing.
   • […] yonger ſpirits, […] whoſe conſtancies Expire before their faſhions: […] - c. 1604–1605 (date written), William Shakespeare, “All’s Well, that Ends Well”, in Mr. William Shakespeares Comedies, Histories, & Tragedies...