a lone wolf.
a lonely crossroads.
a lonely existence.
a lonely fisherman stood on a tuft of gravel.
a lonely soul.
a lonesome pine.
a man of a solitary disposition.
a solitary instance of cowardice.
a solitary retreat.
a solitary speck in the sky.
a solitary traveler.
a solitary walk.
a trail leading to an unfrequented lake.
an only child.
he was alone when we met him.
he was held in solitary.
she is alone much of the time.
solitary bees.
the lone doctor in the entire county.
the lone skier on the mountain.
the sole example.
the sole heir.