English to English

noun (n)

• persistent morbid meditation on a problem(noun.feeling)

  Synonym:
  brooding
  

  source: wordnet30
• deep serious thoughtfulness(noun.attribute)

  Synonym:
  contemplativeness, meditativeness
  

  source: wordnet30
• The state of being pensive; serious thoughtfulness; seriousness.(noun)

  source: webster1913