Origin: 1400–50; late ME
empoverishen < MF
empovriss- (long s. of
empovrir), equiv. to
em- em- 1 +
povre poor +
-iss -ish 2 
Related forms: im⋅pov⋅er⋅ish⋅er, noun
im⋅pov⋅er⋅ish⋅ment, noun
Synonyms:
2. deplete, drain; weaken, enervate, fatigue, cripple.
Antonyms:
1, 2. enrich.