affected with, characterized by, or causing a depressing feeling of being alone; lonesome.

destitute of sympathetic or friendly companionship, intercourse, support, etc.

a lonely exile.

lone; solitary; without company; companionless.

remote from places of human habitation; desolate; unfrequented; bleak

a lonely road.

standing apart; isolated

a lonely tower.

noun

alienation , aloneness , desolation , forlornness , friendlessness , heartache , lonesomeness , remoteness , seclusion , solitariness , solitude , withdrawal , isolation , singleness