Noun loneliness has 3 senses
  1. loneliness, solitariness - the state of being alone in solitary isolation
    --1 is a kind of isolation
  2. forlornness, loneliness, desolation - sadness resulting from being forsaken or abandoned
    --2 is a kind of sadness, unhappiness
  3. aloneness, loneliness, lonesomeness, solitude - a disposition toward being alone
    --3 is a kind of disposition, temperament
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