Definition of weaken in English:

weaken

Syllabification: weak·en
Pronunciation: /ˈwēkən
 
/

verb

Make or become weaker in power, resolve, or physical strength: [with object]: fault lines had weakened and shattered the rocks [no object]: his resistance had weakened
More example sentences
  • She hates this kind of thing normally, but all the hype and good reviews weakened her resolve.
  • It did not weaken his resolve, although there are times when bitterness wells to the surface.
  • His squad may be physically weakened, but he believes their resolve remains strong.
Synonyms
enfeeble, debilitate, incapacitate, sap, enervate, tire, exhaust, wear out;
wither, cripple, disable, emasculate
reduce, decrease, diminish, soften, lessen, moderate, temper, dilute, blunt, mitigate
decrease, dwindle, diminish, wane, ebb, subside, peter out, fizzle out, tail off, decline, falter
impair, undermine, erode, eat away at, compromise;
invalidate, negate, discredit

Derivatives

weakener

noun
More example sentences
  • These are notorious weakeners of the immune system.
  • Says Coleridge, one of the foremost of English thinkers: ‘I believe the habit of perusing periodical works may be properly added to the catalogue of anti-mnemonics, or weakeners of the memory.’
  • As you might expect, increasing the number of interior walls in the signal's line of sight, ie fixed signal weakeners, made interference more likely, though again, a decent picture was usually possible, sometimes by making minor adjustments to the precise location of the receiver.

Definition of weaken in: