The Collaborative International Dictionary of English v.0.48:

Lonely \Lone"ly\, a. [Compar. Lonelier; superl. Loneliest.]
   [Shortened fr. alonely.]
   1. Sequestered from company or neighbors; solitary; retired;
      as, a lonely situation; a lonely cell.
      [1913 Webster]

   2. Alone, or in want of company; forsaken.
      [1913 Webster]

            To the misled and lonely traveler.    --Milton.
      [1913 Webster]

   3. Not frequented by human beings; as, a lonely wood.
      [1913 Webster]

   4. Having a feeling of depression or sadness resulting from
      the consciousness of being alone; lonesome.
      [1913 Webster]

            I am very often alone. I don't mean I am lonely.
                                                  --H. James.

   Syn: Solitary; lone; lonesome; retired; unfrequented;
        sequestered; secluded.
        [1913 Webster]