26. hard-working=
assiduous (someone who is assiduous works hard or does things very thoroughly)
27. difficult=
arduous (if something is arduous, it is difficult and tiring, and involves a lot of efforts)
28. poor(soil)=
barren
infertile (used to describe the soil is so poor that plants cannot be planted on it)
29. fragile=
brittle
vulnerable (someone who is vulnerable is easily hurt emotionally or physically)
30. show=
demonstrate (to demonstrate a fact means tp make it clear to people)
31. big=
massive (large in size, quantity, or extent)
colossal (use this word, you emphasize something’s large)
tremendous (INFORMAL)
32. avoid=
shun (if someone shuns something, she/he deliberately avoid that something or keep away from it)
33. fair=
impartial (someone who is impartial is able to give a fair opinion or decision on something)
34. attack=
assault (physically attack someone)
assail (attack violently)
35. dislike=
abhor (abhor means you hate something to a extreme extent for moral reasons)
loathe (dislike very much)
36. ruin=
devastate (it means damage something very badly, or utterly destroy it.)
39. always=
invariably (the same as always, but better than always)
40. forever=
perpetual (a perpetual state never changes)
immutable (something immutable will never change or be changed)
41. surprise=
startle (it means surprise you slightly)
astound (surprise you to a large degree)
astonish (the same as astound)
42. enthusiasm=
zeal (a great enthusiasm)
fervency (sincere and enthusiasm)
43. quiet=
tranquil (calm and peaceful)
serene (calm and quiet)
44. expensive=
exorbitant (it means too expensive that it should be)
45. luxurious=
lavish (impressive and very expensive)
sumptuous (grand and very expensive）
46. boring=
tedious (if you describe something tedious, you mean it is boring and frustrating)
47. respect=
esteem (if you esteem someone, you respect and admire him/her.FORMAL)
48. worry=
fret (if you fret about something, you worry about it)
49. cold=
chilly (unpleasantly cold)
icy (extremely cold)
50. hot=
boiling (very hot)