disappeared, lost, vanished, missing

missing, absent, concealed, vanished; third-person (grammar)

missing, skipping, missed, skipped (of a religious duty and of fulfilling that duty later, like prayers); judgment; fate, destiny

missing teeth

absent (from a class, event, etc.)

secret, hidden, concealed; disordered, distressed

to hide, be covered, concealed; to be stolen

secret, concealed, introspect, intimate

unclear, unknown, indefinite, doubtful, concealed, secret

instrument, tool, device, apparatus; particle (grammar)

connecting, linking, oblique (grammar)

interrogative (grammar)

duration; persistence, steadfastness; imperfect or continuous past aspect/tense (grammar)

continuous, continual, prolonged, imperfect or continuous aspect/tense (grammar)