early 15c., "honesty, genuineness," from Middle French sinceritie (early 16c., Modern French sincérité) and directly from Latin sinceritatem (nominative sinceritas) "purity, soundness, wholeness," from sincerus "whole, clean, uninjured," figuratively "sound, genuine, pure, true, candid, truthful" (see sincere).
they demanded some proof of my sincerity
his sincerity inspired belief
the simple sincerity of folk songs
sin
Sinai
since
sincere
sincerely
sincerity
sinciput
sine
sine die
sine prole
sine qua non
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