weakening

adj. becoming weak; diminishing; tiring, flagging

n. state of becoming weak; act of making weak

v. make weak; be made weak

Monotonicity of entailment is a property of many logical systems that states that the hypotheses of any derived fact may be freely extended with additional assumptions. In sequent calculi this property can be captured by an inference rule called weakening, or sometimes thinning, and in such systems one may say that entailment is monotone just in case the rule is admissible. Logical systems with this property are occasionally called monotonic logics in order do differentiate them from non-monotonic logics.
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Noun
1. becoming weaker
(antonym) strengthening
(hypernym) transformation, transmutation, shift
(hyponym) debilitation, enervation, enfeeblement, exhaustion
(derivation) weaken
2. the act of reducing the strength of something
(antonym) strengthening
(hypernym) decrease, diminution, reduction, step-down
(hyponym) wilt, wilting
(derivation) weaken
Adjective
1. causing debilitation
(synonym) debilitative, enervating, enfeebling
(similar) debilitating
2. moderating by making pain or sorrow weaker
(similar) moderating

Verb
1. lessen the strength of; "The fever weakened his body"
(antonym) strengthen, beef up, fortify
(hypernym) change, alter, modify
(hyponym) de-energize, de-energise
(derivation) weakener
2. become weaker; "The prisoner's resistance weakened after seven days"
(antonym) strengthen
(hypernym) decrease, diminish, lessen, fall
(hyponym) attenuate
(derivation) weakening
3. destroy property or hinder normal operations; "The Resistance sabotaged railroad operations during the war"
(synonym) sabotage, undermine, countermine, counteract, subvert
(hypernym) disobey
(hyponym) derail
4. reduce the level or intensity or size or scope of; "de-escalate a crisis"
(synonym) de-escalate, step down
(hypernym) decrease, lessen, minify
(derivation) weakener
5. lessen in force or effect; "soften a shock"; "break a fall"
(synonym) dampen, damp, soften, break
(hypernym) deaden, blunt
(hyponym) deafen
(derivation) weakener

(p. pr. & vb. n.)
of Weaken
  

wan2 wu4 sang4 zhi4
Riding a hobby ruins one's will.
To be excessively devoted to a pastime as to weaken the will to make progress.