[syn: lonely, lonesome]
The Collaborative International Dictionary of English v.0.48:
Lonesome \Lone"some\, a. [Compar. Lonesomer; superl.
   Lonesomest.]
   1. Secluded from society; not frequented by human beings;
      solitary.
      [1913 Webster]
            Like one that on a lonesome road
            Doth walk in fear and dread.          --Coleridge.
      [1913 Webster]
   2. Conscious of, and somewhat depressed by, solitude; as, to
      feel lonesome.
      [1913 Webster] -- Lone"some*ly, adv. --
      Lone"some*ness, n.
      [1913 Webster]
WordNet (r) 3.0 (2006):
lonesome
    adj 1: 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" [syn: lone(a), lonesome(a), only(a),
           sole(a), solitary(a)]
    2: marked by dejection from being alone; "felt sad and lonely";
       "the loneliest night of the week"; "lonesome when her husband
       is away"; "spent a lonesome hour in the bar" [syn: lonely,
       lonesome]
Moby Thesaurus II by Grady Ward, 1.0:
44 Moby Thesaurus words for "lonesome":
   abandoned, alienated, all alone, alone, aloof, apart,
   companionless, deserted, detached, devious, estranged, forsaken,
   friendless, homeless, in solitude, insular, isolated, kithless,
   lone, lonely, out-of-the-way, outcast, rejected, remote, removed,
   retired, rootless, secret, separate, separated, single-handed,
   solitary, solo, unabetted, unaccompanied, unaided, unassisted,
   unattended, unescorted, unpopular, unseconded, unsupported,
   unwelcome, withdrawn