Freedom from discomfort and worry: comfort.
Looseness or pliancy, often derogatory
Freedom from inhibition and awkwardness: grace.
Lack of harshness: gentleness, kindness.
Lack of concern or care: carelessness, indolence.
Lack of difficulty; quality of not being frustrating, difficult, or dense (compact).
Lack of firm conviction: gullibility, credulity.
Lack of difficulty or trouble: facility; simplicity.
The property of being restful.