Sorry, no online dictionaries contain the exact phrase opposite of nonchalant.
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Reverse dictionary results:
1. casual
2. carefree
3. cavalier
4. blase
5. cool
6. shuffle
7. angst
8. death
9. level
10. negligence
11. philosophical
12. promiscuous
13. throw
14. calm
15. affable
16. defiant
17. engaged
18. insolent
19. insouciant
20. negligent
21. nonchalance
22. nonchalantly
23. unconcerned
24. airy
25. aloof
26. breezy
27. casualness
28. glib
29. pococurante
30. apathetic
31. arrogant
32. attentive
33. brusque
34. careless
35. cocky
36. condescending
37. debonair
38. diffident
39. disdainful
40. dismissive

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