nouns
a lack of penetration or subtlety
"they took advantage of her simplicity"
the quality of being simple or uncompounded
"the simplicity of a crystal"
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"
lack of ornamentation
"the room was simply decorated with great restraint"