Where does “sincérité” come from?

sincérité (Middle French) comes from Latin sinceritas, from Latin sincerus, from Latin crescere, from Latin cresco, from Proto-Italic krēskō, from Proto-Indo-European ḱer-, from Proto-Indo-European kr̥-, from Proto-Indo-European ker- — army.

Ancestry of “sincérité”, step by step

StepLanguageWordMeaning
1Latinsinceritasintegrity, honesty; soundness, wholeness; moral...
2Latinsincerusclean, pure, sound; uninjured, whole; real,...
3Latincrescerepresent active infinitive of crēscō; to spring...
4LatincrescoI increase, rise, grow, thrive; multiply,...
5Proto-Italickrēskō
6Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
7Proto-Indo-Europeankr̥-to turn, to bend
8Proto-Indo-Europeanker-army
Every word from Proto-Indo-European ker-Every word from Proto-Indo-European kr̥-Every word from Proto-Indo-European ḱer-