Subtle - Definition
subtle
adj 1: difficult to detect or grasp by the mind or analyze; "his
whole attitude had undergone a subtle change"; "a subtle
difference"; "that elusive thing the soul" [syn:
elusive, subtle]
2: able to make fine distinctions; "a subtle mind"
3: working or spreading in a hidden and usually injurious way;
"glaucoma is an insidious disease"; "a subtle poison" [syn:
insidious, pernicious, subtle]