misplaced,
mislaid, missing, gone, nowhere to be found, gone astray, vanished,
absent
disoriented,
adrift, astray
deep
in thought, spellbound, entranced, rapt, engrossed, absorbed,
preoccupied
confused,
bewildered, bemused, at sea, stumped, puzzled, perplexed, mystified, baffled,
flummoxed (informal)
forlorn,
vulnerable, abandoned, alone, aimless, helpless