behind the curtain behind the scenes camouflaged concealed disguised hidden imperceptible indiscernible insensible invisible latent neglected out of sight secret sightless submerged unaccomplished unachieved unapparent unattained unbeheld unbeholdable uncompleted unconsummated undiscernible undischarged undone unexecuted unfinished unfulfilled unnoticed unobserved unperceivable unperceived unperformed unseeable unseen unviewed unwitnessed viewless