imperceptible

adjective

impossible or difficult to perceive by the mind or senses
心または感覚によって認めるのが不可能であるか難しい
- an imperceptible drop in temperature
  温度のわずかな低下
- an imperceptible nod
  わずかなうなずき
- color is unperceivable to the touch
  色は触ることで感知しにくい

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