nonchalantness 

Is someone who cares about another person but doesn't want to show that they care.

He would have to give some of his nonchalantness up and meet me in the middle to make the relationship work.

nonchalantness by Gusto66 February 3, 2021

nonchalantest 

the most nonchalant person to ever exist.

1st person: you aren’t even nonchalant

2nd person: you’re right, i’m actually the most nonchalantest

nonchalantest by afuegonewman June 24, 2024