earnestness

Nouns

(n) an earnest and sincere feeling seriousness, sincerity,
(n) the trait of being serious
- "a lack of solemnity is not necessarily a lack of seriousness"- Robert Rice
serious-mindedness, seriousness, sincerity,

Synonyms

seriousness sincerity serious-mindedness

Antonyms

frivolity frivolousness

Words of close approximity