" self-assuredness "

1: great faith in oneself or one's abilities;

  * e.g., " ... with the self-assuredness of an old pro, the young gymnast executed the difficult feat "

•  Synonyms : 

•  aplomb,

•  assurance,

•  confidence,

•  self-assurance,

•  self-confidence,

•  self-esteem,

•  self-trust

•  Antonyms : 

•  diffidence,

•  insecurity,

•  self-distrust,

•  self-doubt

1: having or showing great faith in oneself or one's abilities;

  * e.g., " ... he's a self-assured yachtsman who's not at all intimidated by the competition "

•  Synonyms : 

•  assured,

•  confident,

•  secure,

•  self-asserting,

•  self-confident

•  Antonyms : 

•  diffident,

•  insecure,

•  self-distrustful,

•  self-doubting