aplomb

"Her confidence in her ability to speak French helped her to participate more in class discussions. "

"The perpendicular to the wall supported the shelf. "

"Despite failing the exam, he shrugged with nonchalance and said he wasn't worried about it. "

"After days of inquiries, he finally recovered his lost wallet."

"The young girl dreamed of becoming a famous ballerina one day. "

"He listened carefully to his mother's concerns, feeling sorrowful about her disappointment. "

"He wanted to exhibit his baseball cards."

"The main character in the school play was a brave student. "

"The surgeon's precision during the operation ensured a quick and successful recovery for the patient. "

"Despite the noisy classroom, Sarah maintained her composure and answered the difficult question correctly. "

"The student diligently worked on the project and accomplished all the assigned tasks. "

"My closest confident, my sister, always listens patiently and gives good advice. "