In view of the mercurial nature of one half of the dual-fold topic of this analysis, perhaps it would hold both me, as the author, and you, as the reader, jointly in good stead to open with an attempt at a definition. What is sincerity? Sincerity is a noun. Among other things, it refers to the absence of pretense, deceit, and/or hypocrisy. Its synonyms include the followi…