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Synonyms
sub·tle (sŭt́l)

[Middle English sotil, from Old French, from Latin subtīlis.]

adjective: sub·tler, sub·tlest. 

    1. So slight as to be difficult to detect or describe; elusive: a subtle smile.
    2. Difficult to understand; abstruse: an argument whose subtle point was lost on her opponent.
  2. Able to make fine distinctions: a subtle mind.
    1. Characterized by skill or ingenuity; clever.
    2. Crafty or sly; devious.
    3. Operating in a hidden, usually injurious way; insidious: a subtle poison.

derivatives

sub́tle·ness
noun
sub́tly
adverb