This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality or condition of being sincere; genuineness, honesty, and freedom from duplicity.

n. The quality or state of being sincere; honesty of mind or intention; freedom from simulation, hypocrisy, disguise, or false pretense.

n. The quality or state of being sincere; honesty of mind or intention; freedom from simulation, hypocrisy, disguise, or false pretense; sincereness.

n. The state or character of being sincere.

n. Freedom from duplicity, deceit, or falsehood; honesty; truthfulness.

n. Integrity; uprightness; faithfulness.

n. Synonyms See sincere.

n. a quality of naturalness and simplicity

n. the trait of being serious

n. the quality of being open and truthful; not deceitful or hypocritical

n. an earnest and sincere feeling

"But it is precisely because it is so rare and unexpected that his story catches our attention, almost provokes our amusement - in a fashion reminiscent of the cartoon of a young woman carrying a 'Make love not war' banner, stark naked, and with a bystander exclaiming, 'Now that's what I call sincerity!'"

insincerity   

naturalness    solemnity    gravity   

purity    order of sincerity   

sincere   

sincereness    honesty   

Solidarity    Verity    barbarity    celerity    clarity    dexterity    disparity    familiarity    hilarity    irregularity   

honesty    earnestness    devotion    humility    frankness    fidelity    piety    innocence    truthfulness    friendliness