loneliness loneliness /ˈloʊnliːnəs/

noun

1. () The state of being alone in solitary isolation  ( solitariness , loneliness )
   the state of being alone in solitary isolation
     The old man's loneliness was palpable as he sat alone in the park.
   The old man's loneliness was palpable as he sat alone in the park.
   
2. () Sadness resulting from being forsaken or abandoned  ( desolation , forlornness , loneliness )
   sadness resulting from being forsaken or abandoned
   
   
3. A disposition toward being alone  ( loneliness , lonesomeness , solitariness , aloneness )
   a disposition toward being alone