1.Definition: a quality of naturalness and simplicity

"The simple sincerity of folk songs"

Category: General

2.Definition: an earnest and sincere feeling

Related Noun(s):earnestness, seriousness

Category: Feelings

3.Definition: the quality of being open and truthful; not deceitful or hypocritical

"His sincerity inspired belief", "They demanded some proof of my sincerity"

Category: General

4.Definition: the trait of being serious

Related Noun(s):earnestness, seriousness

Category: General