01 n. The quality or state of being subtle, or sly; cunning; craftiness; artfulness.
pl.
Subtleties ((#))
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1.
The quality or state of being subtle, or sly; cunning; craftiness; artfulness.“The fox which lives by subtlety.” — Shak.
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2.
Nice discernment with delicacy of mental action; nicety of discrimination.
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3.
Something that is sly, crafty, or delusive.“Unlearned in the world's false subtleties.” — Shak.