Where does “simple-heartedness” come from?

simple-heartedness (English) comes from English simple-hearted, from English simple, from Middle English symple, from Old French simple, from Latin simplex, from Latin -plex, from Latin plicō, from Proto-Indo-European pleḱ- — to cover, to wrap; skin, hide, cloth; to fold.

simple-heartedness (English): The state or quality of being simple-hearted;...

Definitions

  1. The state or quality of being simple-hearted;...

Ancestry of “simple-heartedness”, step by step

simple-heartedness traces back through two separate lines of ancestry.

via English simple-hearted

StepLanguageWordMeaning
1Englishsimple-heartedsincere; ingenuous; guileless
2EnglishsimpleUncomplicated; taken by itself, with nothing...
3Middle Englishsymplevirtuous, godly, without sin; simple, spartan,...
4Old Frenchsimpleinnocent; mere; simple; honest; without pretense
5Latinsimplexsingle; simple, plain, uncompounded; pure,...
6Latin-plex-fold
7Latinplicōto fold, bend or flex; to roll up
8Proto-Indo-Europeanpleḱ-to fold, plait, weave
9Proto-Indo-Europeanpel-to cover, to wrap; skin, hide, cloth; to fold

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European pel-Every word from Proto-Indo-European pleḱ-Every word from Latin plicō