Definitions from Wiktionary (subtle)

▸ adjective:  Hard to grasp; not obvious or easily understood.
▸ adjective:  Barely noticeable, not obvious, indistinct.
▸ adjective:  (of a thing) Cleverly contrived.
▸ adjective:  Designed to blend in; inconspicuous, nonintrusive.
▸ adjective:  (of a person or animal) Cunning, skillful.
▸ adjective:  Insidious.
▸ adjective:  Tenuous; rarefied; of low density or thin consistency.
▸ adjective:  (obsolete) Refined; exquisite.
▸ Also see subtle

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