How can you be so nonchalant about such an important job interview?He was nervous about asking her out, but he tried to seem nonchalant.The judge seemed annoyed by Lindsay Lohan's nonchalant attitude...
"The young composer was very nonchalant about winning the Pulitzer Prize for music, as if it were something every young composer did."
Example sentence - He acted quite nonchalant about the evening with her.
The man was nonchalant
She was talking nonchalantly to her mom.