Akademik

sincerity
noun
1. an earnest and sincere feeling (Freq. 2)
Syn: ↑earnestness, ↑seriousness
Derivationally related forms: ↑sincere, ↑earnest (for: ↑earnestness)
Hypernyms: ↑gravity, ↑solemnity
2. the quality of being open and truthful; not deceitful or hypocritical (Freq. 2)
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his sincerity inspired belief

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they demanded some proof of my sincerity

Ant: ↑insincerity
Derivationally related forms: ↑sincere
Hypernyms: ↑truthfulness
Hyponyms: ↑heartiness, ↑wholeheartedness, ↑singleness, ↑straightforwardness
Attrubites: ↑sincere, ↑insincere
3. a quality of naturalness and simplicity (Freq. 1)
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the simple sincerity of folk songs

Syn: ↑unassumingness
Derivationally related forms: ↑unassuming (for: ↑unassumingness)
Hypernyms: ↑naturalness
4. the trait of being serious
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"a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice

Syn: ↑seriousness, ↑earnestness, ↑serious-mindedness
Ant: ↑frivolity (for: ↑seriousness)
Derivationally related forms: ↑sincere, ↑serious-minded (for: ↑serious-mindedness), ↑earnest (for: ↑earnestness), ↑serious (for: ↑seriousness)
Hypernyms: ↑trait
Hyponyms:
committedness, ↑commitment, ↑graveness, ↑gravity, ↑sobriety, ↑soberness, ↑somberness, ↑sombreness, ↑sedateness, ↑staidness, ↑solemnity, ↑solemness
Attrubites: ↑serious, ↑frivolous

Useful english dictionary. 2012.