adjective (a)

• conducive to good health of body or mind(adj.all)

  Example:
  A healthful climate.
  A healthful environment.
  Healthful nutrition.
  Healthful sleep.
  Dickens's relatively healthful exuberance.
  

  Antonym:
  unhealthful
  

  source: wordnet30
• free from filth and pathogens(adj.all)

  Synonym:
  sanitary
  Antonym:
  insanitary, unhealthful, unsanitary
  

  source: wordnet30
• Full of health; free from illness or disease; well; whole; sound; healthy; as, a healthful body or mind; a healthful plant.(adjective)

  source: webster1913