Disappearance

Noun

 * 1) The action of disappearing or vanishing.

Adjectives for Disappearance
unexpected;  unexplained;   irretrievable; inexplicable; sudden; gradual; virtual.

Adverbs for Adjectives
festly; inexpressibly; vaguely; definitely, deeply; poignantly;  horribly; woefully; repeatedly; disconcertingly; tragically; bleakly; senselessly; foolishly; pitiably; terribly; inconsolably; forlornly; miserably; wretchedly; cruelly.

Thesaurus
French leave, abscondence, absence, absence without leave, absentation, absenteeism, absenting, absquatulation, bolt, concealment, cut, day off, decampment, default, departure, desertion, disappearing act, elopement, escape, excused absence, exit, fleeing, flight, fugitation, furlough, hasty retreat, hegira, holiday, hooky, immateriality, imperceptibility, indiscernibility, invisibility, leave, leave of absence, leaving, nonappearance, nonattendance, quick exit, running away, sabbatical leave, scramming, secrecy, sick leave, skedaddle, skedaddling, the invisible, the unseen, truancy, truantism, unexcused absence, unperceivability, unseeableness, unsubstantiality, vacation, viewlessness