Theory:

Meanings and opposites of difficult words from the poem:
 
Words
Meanings
Opposites/Antonyms
QuiversTremble or shake with a slight rapid motion
-
BreezeA gentle wind
-
PleasantGiving a sense of happy satisfaction.Unpleasant
ShadeComparative darkness and coolness caused by shelter
 -
BladeThe flat cutting edge of a knife
 -
LargestConsiderably great sizeSmallest
StraightExtend uniformly in one directionZigzag
TallMore than normal height Short
SmallLittleBig
SharpHaving an edge that cuts into somethingBlunt 
Good
-
Bad
Useful
Used for a practical purpose.
Useless