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Adjective: subtle (subtler,subtlest)  sú-t(u)l
  1. Difficult to detect or grasp by the mind or analyse
    "his whole attitude had undergone a subtle change"; "a subtle difference";
    - elusive
     
  2. Able to make fine distinctions
    "a subtle mind"
     
  3. Working or spreading in a hidden and usually injurious way
    "a subtle poison";
    - insidious, pernicious

Derived forms: subtler, subtlest

See also: harmful, impalpable, perceptive

Encyclopedia: Subtle