simpleness/ˈsɪm.pəl.nəs/EtymologyFrom Middle English symplenesse; equivalent to simple + -ness.simpleness means the property of being simple. Lexicurio rates it Sui generis — a strength score of 86 out of 100.simpleness is pronounced /ˈsɪm.pəl.nəs/.nounThe property of being simple.