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Which of these words is worth to learn? 1. aberration 2. abhor 3. acquiesce 4. alacrity 5. amiable 6. appease 7. arcane 8. avarice 9. brazen 10. brusque 11. cajole 12. callous 13. candor 14. chide 15. circumspect 16. coerce 17. coherent 18. complacency 19. confidant 20. connive 21. cumulative 22. debase 23. decry 24. deferential 25. demure 26. deride 27. despot 28. diligent 29. elated 30. eloquent 31. embezzle 32. empathy 33. enmity 34. erudite 35. extol 36. fabricate 37. flabbergasted 38. forsake 39. furtive 40. gluttony 41. gratuitous 42. haughty 43. hypocrisy 44. impeccable 45. impertinent 46. impudent 47. indolent 48. inept 49. infamy 50. inhibit 51. innate 52. insatiable 53. insular 54. intrepid

Corrections · 4

3
These are the ones that you'll actually come across in books/conversation:

1. aberration
2. abhor
5. amiable
6. appease
7. arcane
8. avarice
9. brazen
10. brusque
12. callous
14. chide
15. circumspect
16. coerce
17. coherent
18. complacency
19. confidant
21. cumulative
22. debase
23. decry
24. deferential
26. deride
28. diligent
29. elated
30. eloquent
31. embezzle
32. empathy
36. fabricate
37. flabbergasted
38. forsake
39. furtive
40. gluttony
41. gratuitous
42. haughty
43. hypocrisy
44. impeccable
45. impertinent
48. inept
49. infamy
50. inhibit
51. innate
52. insatiable
53. insular
54. intrepid
0
These are all useful words, and I use most of them regularly. I would encourage you to learn them all, especially if you're in academia or if you plan to read English literature, white papers, or nonfiction. However, if you're trying to figure out where to start, there are some that you're more likely to come across in general contexts or in the news: acquiesce, amiable, appease, coherent, complacency, cumulative, deferential, diligent, eloquent, empathy, fabricate, gratuitous, hypocrisy, inhibit, innate. 

Unlike most of the words on your list, "flabbergasted" is informal, so it's the one you're probably most likely to hear in conversation. Where I'm from, people use that a lot more than synonyms like "amazed" or "astonished." If you're more than just surprised, you're "flabbergasted" — the way it sounds when you say it sort of feels like its meaning, and it's more colorful than "surprised" or "shocked."
0
I would say all of them! They are not uncommon among literate English-speakers (particularly readers) and are great examples of the greatness of the English lexicon.

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