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Use "trustingness" in a sentence
"That rottenness counts on the trustingness as well as the apathy and/or cynicism of individual citizens."
"From the dictionary, perfidy is defined as "violation of a trust reposed", "from phrase per fidem decipere 'to deceive through trustingness'", "calculated violation of trust; treachery"."
"For instance, the trait of agreeableness may consist of correlated sub-traits: trustingness, altruism, compliance, and tender-mindedness."