資料來源 : pyDict

無法感知,目所不見,細微

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Imperceptibility \Im`per*cep`ti*bil"i*ty\, n.
   The state or quality of being imperceptible.

資料來源 : WordNet®

imperceptibility
     n : the property of being imperceptible [ant: {perceptibility}]