Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

imperceptibility; indistinctness &c adj.; mystery, delitescence†. concealment &c 528; latency &c 526. V. be invisible &c adj.; be hidden &c (hide) 528; lurk &c (lie hidden) 526; escape notice. render invisible &c adj.; conceal &c 528; put out of sight. not see &c (be blind) 442; lose sight of. Adj. invisible, imperceptible; undiscernible†, indiscernible; unapparent, non-apparent; out of sight, not in sight; a perte de vue [Fr.]; behind the scenes, behind the curtain; viewless, sightless; inconspicuous, unconspicuous†; unseen &c (see) &c 441; covert &c (latent) 526; eclipsed, under an eclipse. dim &c (faint) 422; mysterious, dark, obscure, confused; indistinct, indistinguishable; shadowy, indefinite, undefined; ill- defined, ill-marked; blurred, fuzzy, out of focus; misty &c (opaque) 426; delitescent†. hidden, obscured, covered, veiled (concealed) 528. Phr. full many a flower is born to blush unseen [Gray].