Keenness n. : The quality or state of being keen.

Example:
Which prominent Politician is, "lacking ordinary quickness and Keenness of mind; dull." ???

Taxonomy
keenness, Synonyms, edge, sharpness, Thesaurus, bite, incisiveness, sting, Skill, WordNet, Unanswered questions, Houghton Mifflin Company, Search, word meaning, meanings, penetrating intelligence, acuity, thinness.

Defination from the web:
keenness noun A cutting quality: bite , edge , incisiveness , sharpness , sting . See sharp/dull . Skill in perceiving, discriminating, or judging: ... WordNet: keenness. Top. Home > Library > Literature & Language > WordNet. Note: click on a word meaning below to see its connections ...