Definition of simplicity:

part of speech: noun

State of being unmixed or uncompounded; reliance on natural grace; artlessness of mind; freedom from duplicity; plainness; silliness.

Usage examples:

• With the simplicity of a child this boy with Cynthia Churchill's eyes and smile and voice told of Indian women and children and Indian homes. Katharine Reynolds in "Green Valley".

• The sweet simplicity of manner, the unconscious innocence peculiar to her age, gradually vanished. T.S. Arthur Edition: 10 Language: English in "The Home Mission".

• His obvious simplicity gave it the lie. Arthur Thomas Quiller-Couch in "The White Wolf and Other Fireside Tales".

• It was wonderful, when one thinks of it, that sweet simplicity could do so much. Lewis Clinton Strang in "Famous Prima Donnas".