worsener

The English word “worsener” has 2 meanings listed here.

noun

One who or that which worsens (things), makes things worse.
One who or that which worsens (internally), becomes worse, deteriorates in condition.

From worsen + -er.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.