n. 1. The state or quality of being eager; ardent desire. “The eagerness of love.” Addison. [ 1913 Webster ]
2. Tartness; sourness. [ Obs. ]
Syn. -- Ardor; vehemence; earnestness; impetuosity; heartiness; fervor; fervency; avidity; zeal; craving; heat; passion; greediness. [ 1913 Webster ]