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imperceptible

• (a) impossible or difficult to perceive by the mind or senses
  • an imperceptible drop in temperature
  • an imperceptible nod
  • color is unperceivable to the touch
  unperceivable,

Synonyms

unperceivable

Antonyms

perceptible

See also

impalpable inaudible unhearable invisible unseeable

Words of close approximity