assuredness 

英汉解释

n. 确实；自信；确信；厚颜

同义词

n. aplomb，cool，poise，sang-froid

参考例句

1. Life is happier if it is full of easiness and assuredness.
生命是非常美好的，如果生活中充满了从容与自信的话。
2. From that time I have more assuredness to accomplish all my subjects .
从那时候我有信心完成我所有的课程。
3. He was a young man, close to his own age, with sandy blonde hair and an air of assuredness.
爱德华是一个有着和他年龄相称容貌，沙色短发缺乏自信的青年。

英英解释

n.
  1. great coolness and composure under strain

网络释义

assuredness
确信; 确实;
for sure in faith assuredness certitude positivity sure thing
确实;
assurance assuredness be certain of be convinced of certitude feel in one's bones
确信;
assuredness be sure of oneself self-confidence self-trust
自信;