| sincere | (adjective) open and genuine; not deceitful | - |
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| (adjective) characterized by a firm and humorless belief in the validity of your opinions | Synonyms: earnest, solemn |
| sincerely | (adverb) with sincerity; without pretense | Synonyms: truly, unfeignedly |
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| (adverb) written formula for ending a letter | Synonyms: sincerely yours |
| sincerity | (noun) the quality of being open and truthful; not deceitful or hypocritical | - |
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| (noun) the trait of being serious | Synonyms: earnestness, serious-mindedness, seriousness |
| (noun) a quality of naturalness and simplicity | Synonyms: unassumingness |
| (noun) an earnest and sincere feeling | Synonyms: earnestness, seriousness |
| sinciput | (noun) the front part of the head or skull (including the forehead) | - |
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