‘Meh!’ A nonchalant voice couldn't care less. Regardless of how the speaker feels, this voice comes across as indifferent, uninterested. Do you need a formal read that your audience can relate to? Nonchalant voices are naturally calm and smooth, and they can be used in positive as well as negative contexts.
The casual guy-next-door voice that is articulate, personable, and doesn't show a lot of emotion. Yet audiences love to hear the nonchalant voice precisely because it is calm and relaxed. Essentially, a nonchalant voice is the equivalent of a mild shrug.
This is not the voice you want to use in sales, but radio loves nonchalant voices. Laid back, cool, casual, connecting to the listeners in a relatable manner. You’ll also find this voice in audiobook narrations, documentaries, telephony and interactive voice response, e-learning, and much more. Characters in film use nonchalance to hide their feelings or present themselves as tough. Too much nonchalance, however, can come across as mean and offend people.
Yes, nonchalant voices can show a little bit of emotion. Maybe a bit of frustration, or happiness, but underneath their tone, the listener can still tell that the speaker is calm. Nonchalance is about being chill, not about being cold.
There are levels to a nonchalant voice. It can be too extreme to the point of being mean. It can also be a survival mechanism, for instance, a character who finds nonchalance in the face of major tribulation.