sincerity

Noun

• the trait of being serious
  • a lack of solemnity is not necessarily a lack of seriousness- Robert Rice
    

• a quality of naturalness and simplicity
  • the simple sincerity of folk songs
    

• the quality of being open and truthful; not deceitful or hypocritical
  • his sincerity inspired belief
    
  • they demanded some proof of my sincerity
    

• an earnest and sincere feeling

Related words

• Synonyms: 
  seriousness , earnestness , serious-mindedness , unassumingness
• Antonyms: 
  frivolity , frivolousness , insincerity , falseness , hollowness