intelligence - the ability to comprehend; to understand and profit from experience

steel trap - an acute intelligence (an analogy based on the well known sharpness of steel traps); "he's as sharp as a steel trap"; "a mind like a steel trap"

enthusiasm - a feeling of excitement

ardor, ardour, elan, zeal - a feeling of strong eagerness (usually in favor of a person or cause); "they were imbued with a revolutionary ardor"; "he felt a kind of religious zeal"

acuteness - the quality of having a sharp edge or point

shape, configuration, conformation, contour, form - any spatial attributes (especially as defined by outline); "he could barely make out their shapes through the smoke"