acumen, astuteness, caginess(also cageyness), canniness, clear-sightedness, foxiness, hardheadedness, intelligence, keenness, knowingness, sharpness, wit

discernment, insight, perception, perceptiveness, perceptivity, percipience, sagaciousness, sagacity, sageness, sapience, wisdomartfulness, artifice, craft, craftiness, cunning, deviousness, guile, slickness, slyness, sneakiness, subtleness, subtlety, wilinessbrain(s), gray matter, intellect, reason, sense

artlessness, greenness, guilelessness, ingenuousness, innocence, naiveness, naïveté(also naivete or naiveté), simplemindedness, simpleness, simplicity, unsophistication, unworldlinessbrainlessness, density, doltishness, dopiness, dumbness, fatuity, foolishness, half-wittedness, mindlessness, oafishness, obtuseness, senselessness, slowness, stupidity, stupidness, vacuity, witlessness