subtle：释义

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.

Able to make fine distinctions: a subtle mind.

Characterized by skill or ingenuity; clever.

Crafty or sly; devious.

Operating in a hidden, usually injurious way; insidious: a subtle poison.