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a. imperceptible

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a.   perceptible

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1. color is unperceivable to the touch.
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2. an imperceptible drop in temperature; ~an imperceptible nod; color is unperceivable to the touch.
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3. However, love is unperceivable. You can only know what love is when it's understood and translated.
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adj.
  1. impossible or difficult to perceive by the mind or senses