"sweetened" in the verb sense
1. sweeten, dulcify, edulcorate, dulcorate
make sweeter in taste
2. sweeten
make sweeter, more pleasant, or more agreeable
"sweeten a deal"
"sweetened" in the adjective sense
1. sugared, sweetened, sweet, sweet-flavored
with sweetening added
Source: WordNet® (An amazing lexical database of English)
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