"simpleness" in the noun sense
1. simplicity, simpleness, simple mindedness
a lack of penetration or subtlety
"they took advantage of her simplicity"
2. simplicity, simpleness
the quality of being simple or uncompounded
"the simplicity of a crystal"
3. ease, easiness, simplicity, simpleness
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"
4. chasteness, restraint, simplicity, simpleness
lack of ornamentation
"the room was simply decorated with great restraint"
Source: WordNet® (An amazing lexical database of English)
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