Among the currently most popular synonyms for subtle are: keen, wise, penetrating, politic, understated, acute, tenuous, sensitive, percipient, discrete, wily, toned down, refined, sapient, perspicacious, profound, subdued, canny, sagacious, astute, faint, devious, discriminating, cunning, elusive, perceptive, minute, adroit, minuscule, shrewd, dainty, narrow, discreet, overnice, ingenious, crafty, skillful, abstruse, aware, razor-sharp, discerning, exquisite, pale, indirect, on the ball, muted, vague, intelligent, slight, washed out, precise, savvy, fine, unobtrusive, indistinct, fine-drawn, artful, clever, hairsplitting, sophisticated, low-key.