stupidity - a poor ability to understand or to profit from experience

oscitance, oscitancy - drowsiness and dullness manifested by yawning

uninterestingness - inability to capture or hold one's interest

boringness, dreariness - extreme dullness

tediousness, tiresomeness, tedium - dullness owing to length or slowness

jejunity, tameness, vapidity, vapidness, jejuneness - the quality of being vapid and unsophisticated

visual property - an attribute of vision

subduedness, dimness - the property of lacking brilliance

lusterlessness, lustrelessness, matt, matte, flatness, mat - the property of having little or no contrast; lacking highlights or gloss

obtuseness - the quality of lacking 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"