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1. Becoming weaker
    
2. The act of reducing the strength of something

1. Causing debilitation
   - debilitative, enervating, enfeebling
    
2. Moderating by making pain or sorrow weaker

1. Lessen the strength of
   "The fever weakened his body"
    
2. Become weaker
   "The prisoner's resistance weakened after seven days"
    
3. Destroy property or hinder normal operations
   "The Resistance weakened railway operations during the war"
   - sabotage, undermine, countermine, counteract, subvert
    
4. Reduce the level or intensity or size or scope of
   "weaken a crisis"
   - de-escalate, step down
    
5. Lessen in force or effect
   "weaken a shock"
   - dampen, damp, soften, break

See also: debilitating, moderating, weakener

Type of: alter, blunt, change, deaden, decrease, diminish, diminution, disobey, fall, lessen, minify, modify, reduction, shift, step-down, transformation, transmutation

Antonym: strengthen, strengthening

Encyclopedia: Weakening