understanding, apprehension, discernment, savvy -- (the cognitive condition of someone who understands; "he has virtually no understanding of social cause and effect")
taste, appreciation, discernment, perceptiveness -- (delicate discrimination (especially of aesthetic values); "arrogance and lack of taste contributed to his rapid success"; "to ask at that particular time was the ultimate in bad taste")
discernment, perceptiveness -- (perception of that which is obscure)