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

1. The process of becoming weaker
    
2. The act of reducing the strength of something

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, intensity, 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

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

Antonym: fortify, intensify, strengthen, strengthening

Encyclopedia: Weakening