The property of being imperceptible by the mind or the senses.

Roget 447: invisibility, invisibleness, nonappearance, imperceptibility; indistinctness etc. adj.; mystery, delitescence^†.    concealment etc. 528; latency etc. 526.    ... show more

Roget 526: latency, inexpression^†; hidden meaning, occult meaning; occultness, mystery, cabala^†, anagoge^†; silence etc. (taciturnity) 585; concealment etc. 528; more than meets the eye, more than meets the ear; Delphic oracle; le dessous des cartes [Fr.], undercurrent.    implication, logical implication; logical consequence; entailment.    allusion, insinuation; innuendo etc. 527; adumbration; something rotten in the state of Denmark" [Hamlet]. snake in the grass etc. (pitfall) 667; secret etc. 533.    darkness, invisibility, imperceptibility.    ... show more

Polish: niepostrzegalność, niedostrzegalność