资料来源 : pyDict

无法感知,目所不见,细微

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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

资料来源 : WordNet®

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