WEAK Synonyms: 289 Similar and Opposite Words

Q: How does the adjective 'weak' contrast with its synonyms?

Some common synonyms of weak are decrepit , feeble , fragile , frail , and infirm . While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," weak applies to deficiency or inferiority in strength or power of any sort. // felt weak after the surgery

Q: When is it sensible to use 'decrepit' instead of 'weak'?

The synonyms decrepit and weak are sometimes interchangeable, but decrepit implies being worn-out or broken-down from long use or old age. // the dowager's decrepit retainers

Q: In what contexts can 'feeble' take the place of 'weak'?

Although the words feeble and weak have much in common, feeble suggests extreme weakness inviting pity or contempt. // a feeble attempt to walk

Q: When might 'fragile' be a better fit than 'weak'?

While in some cases nearly identical to weak , fragile suggests frailty and brittleness unable to resist rough usage. // a reclusive poet too fragile for the rigors of this world

Q: When is 'frail' a more appropriate choice than 'weak'?

The meanings of frail and weak largely overlap; however, frail implies delicacy and slightness of constitution or structure. // a frail teenager unable to enjoy sports

Q: Where would 'infirm' be a reasonable alternative to 'weak'?

The words infirm and weak are synonyms, but do differ in nuance. Specifically, infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness. // infirm residents requiring constant care

weak

adjective

ˈwēk

Definition of weak

as in weakened

lacking bodily strength the little boy was simply too weak to lift the box

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in soft

lacking strength of will or character I was too weak to resist the free doughnuts in the office break room

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Antonyms & Near Antonyms

as in thin

not containing very much of some important element the coffee came out too weak because I didn't use enough ground beans

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Antonyms & Near Antonyms

as in unreasonable

not using or following good reasoning your argument is weak

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Antonyms & Near Antonyms

as in helpless

unable to act or achieve one's purpose the vice president is a relatively weak official

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Antonyms & Near Antonyms

Synonym Chooser

How does the adjective weak contrast with its synonyms?

Some common synonyms of weak are decrepit, feeble, fragile, frail, and infirm. While all these words mean "not strong enough to endure strain, pressure, or strenuous effort," weak applies to deficiency or inferiority in strength or power of any sort.

felt weak after the surgery

When is it sensible to use decrepit instead of weak?

The synonyms decrepit and weak are sometimes interchangeable, but decrepit implies being worn-out or broken-down from long use or old age.

the dowager's decrepit retainers

In what contexts can feeble take the place of weak?

Although the words feeble and weak have much in common, feeble suggests extreme weakness inviting pity or contempt.

a feeble attempt to walk

When might fragile be a better fit than weak?

While in some cases nearly identical to weak, fragile suggests frailty and brittleness unable to resist rough usage.

a reclusive poet too fragile for the rigors of this world

When is frail a more appropriate choice than weak?

The meanings of frail and weak largely overlap; however, frail implies delicacy and slightness of constitution or structure.

a frail teenager unable to enjoy sports

Where would infirm be a reasonable alternative to weak?

The words infirm and weak are synonyms, but do differ in nuance. Specifically, infirm suggests instability, unsoundness, and insecurity due to old age or crippling illness.

infirm residents requiring constant care

Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of weak Cruise is typically a big draw overseas, but international sales, $12 million from 74 markets, were also weak. — Jake Coyle, Fortune, 4 Oct. 2026 Then came the surprising part The team used muon spin relaxation to look for extremely weak magnetic fields inside the material. — Rupendra Brahambhatt, Interesting Engineering, 3 Oct. 2026 That binding — along with effects similar to opioid drugs such as heroin, oxycodone or fentanyl — makes kratom an opioid-like drug, though its biological effects are weaker than those of typical opioids. — Kristen Rogers, CNN Money, 3 Oct. 2026 Downward revisions for July and August also point to a weaker labor market than first though. — Ashley Gold, semafor.com, 2 Oct. 2026 See All Example Sentences for weak

Recent Examples of Synonyms for weak

Adjective

Aid groups warn more than three-quarters of Gaza’s housing stock is damaged, thousands of buildings are at risk of collapse, and residents grow especially vulnerable when winter rains seep into weakened structures.

— Wafaa Shurafa, Los Angeles Times, 20 Sep. 2026
When people use contaminated soap, bacteria can enter the body through cuts and cracks in the skin and lead to infections, especially in people with weakened immune systems.

— Jenna Anderson, HEALTH, 16 Sep. 2026

Definition of weakened

Adjective

However, the company said beer depletions, a measure of sales from distributors to retailers and other customers, declined slightly during the quarter, indicating consumer demand was softer than shipment growth suggests.

— Brandon Gomez, CNBC, 7 Oct. 2026
Passion fruit seeds are soft and edible, but there are just too many to be enjoyable.

— Carolynn Carreño, Los Angeles Times, 7 Oct. 2026

Definition of soft

Adjective

When new, concrete possesses a thin, temporarily protective layer that, if not maintained, will wear away, exposing the interior, which gradually crumbles.

— Jeffrey Weiss, Artforum, 1 Oct. 2026
Officials issued the alert Monday after a man shared with police an image appearing to show the dangerous reptile slithering from the thin branch of a tree onto the roof of a backyard shed.

— Hannah Fry, Los Angeles Times, 1 Oct. 2026

Definition of thin

Adjective

Then there’s the Tesseract, which takes the scooter formula and crams it with an almost unreasonable amount of technology.

— New Atlas, New Atlas, 3 Oct. 2026
But several individually reasonable events, viewed together and over time, can tell an unreasonable story.

— Shahen Minasyan, Forbes.com, 24 Sep. 2026

Definition of unreasonable

Adjective

Briogeo Destined for Density Serum The Briogeo Destined for Density Serum is a lightweight liquid formula that thickens feeble strands, plumps roots, and rapidly spurs new hair growth.

— Sophie Wirt, InStyle, 17 Sep. 2026
There has to be something more than this, looking feeble against a rookie lefty with average stuff followed by the worst bullpen in baseball.

— Matt Gelb, New York Times, 16 Sep. 2026

Definition of feeble

Adjective

As a result, in Lourdes the question of respecting even the most frail, sick and vulnerable is particularly acute.

— Nicole Winfield, Los Angeles Times, 27 Sep. 2026
Footage from recent Beach Boys shows, though, had many concerned that Love was reaching Frankie Valli levels of uncanny due to a frail voice and appearance.

— Devon Ivie, Vulture, 23 Sep. 2026

Definition of frail

Adjective

Finally, the third recruits seaweed to gather minerals that are otherwise too dilute to chase.

— New Atlas, New Atlas, 27 July 2026
Clean and disinfect your pruning shears between working on each plant by dipping them into a dilute 10% solution of chlorine bleach water or rubbing alcohol.

— Mary Marlowe Leverette, Southern Living, 4 July 2026

Definition of dilute

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“Weak.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/weak. Accessed 9 Oct. 2026.

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Synonyms of weak

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