Etymology
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sincerity (n.)

early 15c., sincerite, "honesty, genuineness," from Old 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).

updated on December 07, 2020

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Definitions of sincerity from WordNet

sincerity (n.)
an earnest and sincere feeling;
Synonyms: earnestness / seriousness
sincerity (n.)
the quality of being open and truthful; not deceitful or hypocritical;
they demanded some proof of my sincerity
his sincerity inspired belief
sincerity (n.)
a quality of naturalness and simplicity;
the simple sincerity of folk songs
Synonyms: unassumingness
sincerity (n.)
the trait of being serious; "a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice;
Synonyms: seriousness / earnestness / serious-mindedness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.