lacking companions or companionship; "he was alone when we met him"; "she is alone much of the time"; "the lone skier on the mountain"; "a lonely fisherman stood on a tuft of gravel"; "a lonely soul"; "a solitary traveler"
9
single(a)
not divided among or brought to bear on more than one object or objective; "judging a contest with a single eye"; "a single devotion to duty"; "undivided affection"; "gained their exclusive attention"