Simpleness

The quality or state of being simple; simplicity.

freedom from difficulty or hardship or effort; "he rose through the ranks with apparent ease"; "they put it into containers for ease of transportation"; "the very easiness of the deed held her back"

the quality of being simple or uncompounded; "the simplicity of a crystal"

lack of ornamentation; "the room was simply decorated with great restraint"

a lack of penetration or subtlety; "they took advantage of her simplicity"