'Weakener' definitions:
Definition of 'weakener'
From: WordNet
noun
That which weakens or causes a loss of strength; "doubt is a great weakener of resolve"
Definition of 'Weakener'
From: GCIDE
- Weakener \Weak"en*er\, n. One who, or that which, weakens. "[Fastings] weakeners of sin." --South. [1913 Webster]