behind the curtain, behind the scenes, camouflaged, concealed, disguised, hidden, ignotus, imperceptible, indiscernible, inglorious, insensible, invisible, latent, little known, nameless, no credit to, obscure, out of sight, overlooked, renownless, secret, sightless, submerged, unapparent, unbeheld, unbeholdable, uncelebrated, unconsidered, undescried, undiscernible, undiscovered, undistinguished, unfamed, unglorified, unheard, unheard-of, unheeded, unhonored, unknown, unmarked, unminded, unmissed, unnotable, unnoted, unobserved, unperceivable, unperceived, unpopular, unrealized, unregarded, unremarked, unrenowned, unseeable, unseen, unsung, unthought-of, unviewed, unwitnessed, viewless