simpleness

(noun) a lack of penetration or subtlety. Synonyms: simplicity, simple mindedness. Example: "They took advantage of her simplicity."

(noun) the quality of being simple or uncompounded. Synonyms: simplicity. Example: "The simplicity of a crystal."

(noun) freedom from difficulty or hardship or effort. Synonyms: ease, easiness, simplicity. Examples: "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."

(noun) lack of ornamentation. Synonyms: chasteness, restraint, simplicity. Example: "The room was simply decorated with great restraint."