Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class III. Words Relating to Matter
Section III. Organic Matter
2. Sensation
(iii) Perceptions of Light

447. Invisibility.

   NOUN:INVISIBILITY, invisibleness, nonappearance, imperceptibility; indistinctness &c. adj.; mystery, delitescence or delitescency.
  CONCEALMENT [See Concealment]; latency [See Latency].
   VERB:BE INVISIBLE &c. adj.; be hidden (hide) [See Concealment]; lurk (lie hidden) [See Latency]; escape notice.
  RENDER INVISIBLE &c. adj.; conceal [See Concealment]; put out of sight.
  not see (be blind) [See Blindness]; lose sight of.
   ADJECTIVE:INVISIBLE, imperceptible; undiscernible, indiscernible; unapparent, nonapparent; out of sight, not in sight; à perte de vue [F.], behind the -scenes, – curtain; viewless, sightless; unconspicuous, inconspicuous; unseen &c. (see see [See Vision]); covert (latent) [See Latency]; eclipsed, under an eclipse.
  INDISTINCT; dim (faint) [See Dimness]; mysterious, dark, obscure, confused; indistinguishable, undiscernible or undiscernable, shadowy, indefinite, undefined; ill-defined, ill-marked; blurred, blurry, fuzzy, out of focus; misty (opaque) [See Opacity]; veiled (concealed) [See Concealment]; delitescent.
   QUOTATION:Full many a flower is born to blush unseen.—Gray