良識
りょうしき · ryoushiki · JLPT N1 · noun
common sense
良 (good) + 識 (knowledge/sense): good judgment that comes from knowing what is right
Built from 良 'good, fine' and 識 'knowledge, discernment'. Together they name the practical common sense that tells a person what is wise and proper.
良 — pictograph of a covered grain hopper
良 originated as a pictograph of a funnel-shaped device used to clean or sift grain, with a top opening, central body, and bottom outlet. From this image of selecting good grain, the meaning extended to 'fine,' 'good,' or 'excellent.' The modern shape obscures the original object.