subtle

Adjective
  1. Difficult to detect or grasp by the mind or analyze (synset 301722138)
    "his whole attitude had undergone a subtle change"; "a subtle difference"; "that elusive thing the soul"
    similar to: impalpable - imperceptible to the senses or the mind
    same as: elusive
  2. Able to make fine distinctions (synset 301750095)
    "a subtle mind"
    similar to: perceptive - having the ability to perceive or understand; keen in discernment
  3. Working or spreading in a hidden and usually injurious way (synset 301165950)
    "glaucoma is an insidious disease"; "a subtle poison"
    similar to: harmful - causing or capable of causing harm
    same as: insidious, pernicious

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