Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Dejected because of a lack of companionship. See Synonyms at alone.
  • adj. Producing such dejection: a lonesome hour at the bar.
  • adj. Deserted; unfrequented: a lonesome valley.
  • adj. Solitary; lone: a lonesome pine.
  • n. Informal Self: He ate the meal all by his lonesome.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. unhappy due to being alone; lonely
  • n. oneself alone

from the GNU version of the Collaborative International Dictionary of English

  • adj. Secluded from society; not frequented by human beings; solitary.
  • adj. Conscious of, and somewhat depressed by, solitude.

from The Century Dictionary and Cyclopedia

  • Drearily solitary; secluded from society; dejected from want of company.
  • Expressing loneliness or dejection.
  • Secluded; unfrequented; lonely.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. marked by dejection from being alone
  • adj. being the only one; single and isolated from others

Etymologies

From lone +‎ -some, mid-17th century. (Wiktionary)

Examples

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