What is the meaning of lonesome?

adjective

• Being the only one; single and isolated from others.
  • usage: "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"
  • synonyms: lone, only, sole, solitary
• Marked by dejection from being alone.
  • usage: "felt sad and lonely"; "the loneliest night of the week"; "lonesome when her husband is away"; "spent a lonesome hour in the bar"
  • synonyms: lonely