Eagerness; vehemence; as the keenness of hunger.

Sharpness; fineness of edge; as the keenness of a razor.

The quality of piercing; rigor; sharpness; as the keenness of the air or of cold.

Asperity; acrimony; bitterness; as the keenness of satire, invective or sarcasm.

Acuteness; sharpness; as the keenness of wit.