sub·tle:
adj. sub·tler, sub·tlest

1. • so slight as to be difficult to detect or describe; elusive: a subtle smile
   • difficult to understand; abstruse: an argument whose subtle point was lost on her opponent
2. able to make fine distinctions: a subtle mind
3. • characterized by skill or ingenuity; clever
   • crafty or sly; devious
   • operating in a hidden, usually injurious way; insidious: a subtle poison

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