a lone wolf.
a lonely crossroads.
a lonely existence.
a lonely fisherman stood on a tuft of gravel.
a lonely soul.
a man of a solitary disposition.
a solitary retreat.
a solitary traveler.
a solitary walk.
a trail leading to an unfrequented lake.
felt sad and lonely.
he was alone when we met him.
lonesome when her husband is away.
she is alone much of the time.
spent a lonesome hour in the bar.
the lone skier on the mountain.
the loneliest night of the week.