Defintion of avidity, avidness, eagerness, keenness. (n):
A positive feeling of wanting to push ahead with something.
Defintion of eagerness, forwardness, readiness, zeal. (n):
Prompt willingness. "readiness to continue discussions"; "they showed no eagerness to spread the gospel"; "they disliked his zeal in demonstrating his superiority"; "he tried to explain his forwardness in battle".