Not necessarily but a nonchalant attitude can be viewed as noncaring or detached.
dulled by surfeit exhausted (Example: "The amoral, jaded, bored upper classes")
Nonchalant means rude and not proper so if someone would have that attitude it would mean that person wasn't a very polite person.
Someone is considered "jaded" when they think they have seen and done it all, and they act bored and unexcited at whatever is happening around them.
Nonchalant means not concerned or indifferent.
Jaded
To be nonchalant about something means that someone is very easy going about something and acting as if it is easy or is not really that big of a deal to them.
After years of working in the music industry, she became jaded and no longer felt the same excitement about attending concerts.
Synonyms: apathetic casual complacent disinterested incurious insensible insouciant nonchalant perfunctory unconcerned uncurious uninterested
I believe it means they are not telling the complete truth
A person with a jaded heart believes there is no such thing as love. They will use others for their own pleasure not caring how it may hurt the person.
The man was nonchalant