Subtle:
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.

This word has always been elusive to my being. I way of thought has always been extreme. Drive slow or drive fast. Go for it, or don't do it at all. Option A or Option B.

Subtlety would mean finding a delicate balance between those extremes that would fascilitate in accomplishing a goal which could go either way. The subtle decisions would gently sway things one way or another. They would coax, nudge, or guide the decision, not force, push or demand.

I am subtle in other things. Subtle sarcasm, subtle humor, subtle teasing... But subtle opinions? subtle compliments? I don't know if that's possible for me.

There are just some things that must be learned, or else things may not go well at all.