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tr. & intr.v. weak·ened, weak·en·ing, weak·ens
To make or become weak or weaker.

weak′en·er n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.weakener - that which weakens or causes a loss of strength; "doubt is a great weakener of resolve"
agent - an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
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References in periodicals archive ?
Taking Kat Slater away to star in doomed spin-off Redwater was a real weakener for the show's family dynamics.
However, he ended up behind the first weakener and was pushed even further back as others went about their business.
Korea can serve as a facilitator or a delayer, a weakener or a strengthener, and so on.