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Adjective: lonesome  lown-sum
  1. Being the only one; single and isolated from others
    "a lonesome pine";
    - lone, only, sole, solitary
  2. Marked by dejection from being alone
    "lonesome when her husband is away"; "spent a lonesome hour in the bar";
    - lonely

See also: dejected, single

Encyclopedia: Lonesome, On'ry and Mean