Synonyms of weaken

weaken

verb

ˈwē-kən 

1

as in to soften

to diminish the physical strength of

weeks of hardship in the desert had greatly weakened them

Synonyms & Similar Words

• soften
• injure
• debilitate
• hurt
• enfeeble
• waste
• exhaust
• paralyze
• tire
• sap
• enervate
• damage
• impair
• cripple
• deplete
• depress
• devitalize
• incapacitate
• prostrate
• harm
• disable
• etiolate
• impoverish
• hamstring
• invalid
• grind (down)
• lay up
• wash out
• unman
• wear out
• wear down
• break down

Antonyms & Near Antonyms

• strengthen
• fortify
• recruit
• energize
• harden
• beef (up)
• invigorate
• season
• rejuvenate
• vitalize
• toughen

2

as in to fade

to lose bodily strength or vigor

the bodybuilder weakened once she eased off on her workouts

Synonyms & Similar Words

• fade
• sag
• fail
• go
• deteriorate
• sink
• wilt
• decay
• wither
• droop
• languish
• waste (away)
• lag
• emaciate
• flag
• rot
• yield
• wear out
• break down
• degenerate
• run down

Antonyms & Near Antonyms

• recover
• recuperate
• rebound
• rally
• gain
• convalesce

3

as in to dilute

to alter (something) for the worse with the addition of foreign or lower-grade substances

weakened the juice with too much water

Synonyms & Similar Words

• dilute
• infect
• cut
• pollute
• poison
• thin
• manipulate
• load
• extend
• dirty
• spoil
• adulterate
• degrade
• water down
• contaminate
• taint
• soil
• lace
• corrupt
• debase
• cheapen
• sophisticate
• defile
• misrepresent
• temper
• attenuate
• sully
• falsify
• qualify
• counterfeit
• moderate
• foul
• befoul
• tamper (with)
• spike
• envenom
• fake
• fudge
• doctor

Antonyms & Near Antonyms

• strengthen
• enrich
• fortify
• reinforce
• augment
• supplement
• fertilize
• improve
• better
• purify
• enhance
• refine
• clarify
• richen
• clean
• decontaminate
• cleanse
• purge
• flush
• leach
• filter
• distill
• lard
• concentrate
• compact
• condense
• pasteurize

Synonym Chooser

How is the word weaken distinct from other similar verbs?

Some common synonyms of weaken are cripple, debilitate, disable, enfeeble, sap, and undermine. While all these words mean "to lose or cause to lose strength or vigor," weaken may imply loss of physical strength, health, soundness, or stability or of quality, intensity, or effective power.

a disease that weakens the body's defenses

When would cripple be a good substitute for weaken?

While in some cases nearly identical to weaken, cripple implies causing a serious loss of functioning power through damaging or removing an essential part or element.

crippled by arthritis

Where would debilitate be a reasonable alternative to weaken?

The words debilitate and weaken can be used in similar contexts, but debilitate suggests a less marked or more temporary impairment of strength or vitality.

the debilitating effects of surgery

When could disable be used to replace weaken?

While the synonyms disable and weaken are close in meaning, disable suggests bringing about impairment or limitation in a physical or mental ability.

disabled by an injury sustained at work

When might enfeeble be a better fit than weaken?

The synonyms enfeeble and weaken are sometimes interchangeable, but enfeeble implies a condition of marked weakness and helplessness.

enfeebled by starvation

How are the words undermine and sap related as synonyms of weaken?

Both undermine and sap suggest a weakening by something working surreptitiously and insidiously.

a poor diet undermines your health

drugs had sapped his ability to think

Example Sentences

Recent Examples of weaken

Dolly was previously a tropical storm but has since weakened and devolved to a remnant with sustained winds of 40 mph. — Miami Herald Hurricane Bot, Miami Herald, 28 Aug. 2026

Wheat futures hit their highest level in more than three years as the war in Ukraine strained supplies, further weakening the global food system. — Jeronimo Gonzalez, semafor.com, 28 Aug. 2026

Siegel noted that measles weakens the immune system and increases the risk of pneumonia, which can stem from measles itself or from a secondary bacterial infection. — Melissa Rudy, FOXNews.com, 28 Aug. 2026

Narrower set of engines Next week's nonfarm payrolls report could also give some reassurance on how the economy is doing, which remains robust but with weakening pillars of support. — Sarah Min, CNBC, 28 Aug. 2026