Subtil

Subtil - (Webster's 1828 Dictionary)

SUB'TIL, a. [L. subtilis. This word is often written subtle, but less properly.]

1. Thin; not dense or gross; as subtil air; subtil vapor; a subtil medium.

2. Nice; fine; delicate.

I do distinguish plain

Each subtil line of her immortal face.

3. Acute; piercing; as subtil pain.

4. Sly; artful; cunning; crafty; insinuating; as a subtil person; a subtil adversary.

5. Planned by art; deceitful; as a subtil scheme.

6. Deceitful; treacherous.

7. Refined; fine; acute; as a subtil argument.