Source : Webster's Revised Unabridged Dictionary (1913)

Healthful \Health"ful\, a.
   1. Full of health; free from illness or disease; well; whole;
      sound; healthy; as, a healthful body or mind; a healthful
      plant.

   2. Serving to promote health of body or mind; wholesome;
      salubrious; salutary; as, a healthful air, diet.

            The healthful Spirit of thy grace.    --Book of
                                                  Common Prayer.

   3. Indicating, characterized by, or resulting from, health or
      soundness; as, a healthful condition.

            A mind . . . healthful and so well-proportioned.
                                                  --Macaulay.

   4. Well-disposed; favorable. [R.]

            Gave healthful welcome to their shipwrecked guests.
                                                  --Shak.

Source : WordNet®

healthful
     adj 1: conducive to good health of body or mind; "a healthful
            climate"; "a healthful environment"; "healthful
            nutrition"; "healthful sleep"; "Dickens's relatively
            healthful exuberance" [ant: {unhealthful}]
     2: free from filth and pathogens; "sanitary conditions for
        preparing food"; "a sanitary washroom" [syn: {sanitary}]
        [ant: {unsanitary}]