lone

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”

characterized by or preferring solitude in mode of life

• “the eremitic element in the life of a religious colony”
• “a lone wolf”
• “a man of a solitary disposition”

being the only one; single and isolated from others

• “the lone doctor in the entire county”
• “a lonesome pine”
• “an only child”
• “the sole heir”
• “the sole example”
• “a solitary instance of cowardice”
• “a solitary speck in the sky”