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KEY: Addendum.
SYN: Acquisition, improvement, supplement, complement, desideratum, concomitant, annexation, appendage.
ANT: Surplusage, detriment, deterioration, detraction, drawback.
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KEY: Addicted.
SYN: Given, accustomed, prone, inclined, disposed, habituated.
ANT: Unaddicted, disinclined, unaccustomed, indisposed, averse, free.
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KEY: additament.