| 1 | English | nonchalant | Casually calm and relaxed; Indifferent;... |
| 2 | French | nonchalant | Marked by a lack of vivacity, vigour, liveliness;... |
| 3 | Old French | nonchaloir | indifference; uncaringness; to ignore; to pay... |
| 4 | Old French | chaloir | to heat; to bother, to concern |
| 5 | Old French | chaleir | Alternative form of chaloir |
| 6 | Latin | calēre | — |
| 7 | Proto-Italic | kalēō | — |
| 8 | Proto-Indo-European | ḱelh₁- | to warm up, to be hot; to warm up, be hot |