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Subtile

a.
  1. Thin; not dense or gross; rare; as, subtile air; subtile vapor; a subtile medium.
  2. Delicately constituted or constructed; nice; fine; delicate; tenuous; finely woven.
  3. Acute; piercing; searching.
  4. Characterized by nicety of discrimination; discerning; delicate; refined; subtle.
  5. Sly; artful; cunning; crafty; subtle; as, a subtile person; a subtile adversary; a subtile scheme.