When you're not telling the whole truth, you're demonstrating the quality of insincerity. You might detect a politician's insincerity during a speech, and decide to vote for his opponent, who seems more honest.

If you can't stand insincerity, you'll bristle when someone compliments your haircut in a false, overly enthusiastic way — you can tell they're not being forthright with you. Sincerity, the complete absence of any pretense, comes from the Latin sincerus, "whole, clean, or pure," or "genuine." Insincerity adds the "not" prefix in-, resulting in a meaning of "not genuine."

Definitions of insincerity
  1. noun
    the quality of not being open or truthful; deceitful or hypocritical
    synonyms: falseness, hollowness
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    the quality of being open and truthful; not deceitful or hypocritical
    insincerity by virtue of pretending to have qualities or beliefs that you do not really have
    sanctimoniousness, sanctimony
    the quality of being hypocritically devout
    fulsomeness, oiliness, oleaginousness, smarminess, unction, unctuousness
    smug self-serving earnestness
    type of:
    the quality of being untruthful
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