Not readily apparent.

Roget 447: 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 etc. (see) etc. 441; covert etc. (latent) 526; eclipsed, under an eclipse.    dim etc. (faint) 422; mysterious, dark, obscure, confused; indistinct, indistinguishable; shadowy, indefinite, undefined; ill-defined, ill-marked; blurred, fuzzy, out of focus; misty etc. (opaque) 426; delitescent^†.    hidden, obscured, covered, veiled (concealed) 528.    ... show more

Roget 526: latent; lurking etc. v.; secret etc. 528; occult; implied etc. v.; dormant; abeyant.    unapparent, unknown, unseen etc. 441; in the background; invisible etc. 447; indiscoverable^†, dark; impenetrable etc. (unintelligible) 519; unspied^†, unsuspected.    unsaid, unwritten, unpublished, unbreathed^†, untalked of^†, untold etc. 527, unsung, unexposed, unproclaimed^†, undisclosed etc. 529, unexpressed; not expressed, tacit.    undeveloped, solved, unexplained, untraced^†, undiscovered etc. 480.1, untracked, unexplored, uninvented^†.    indirect, crooked, inferential; by inference, by implication; implicit; constructive; allusive, covert, muffled; steganographic^†; understood, underhand, underground; delitescent^†, concealed etc. 528.    ... show more