INSUBSTANTIAL Synonyms: 70 Similar and Opposite Words

insubstantial

adjective

ˌin(t)-səb-ˈstan(t)-shəl

Definition of insubstantial

as in unsubstantial

being of a material lacking in sturdiness or substance an insubstantial carton that could not possibly stand up during long-distance shipping

Synonyms & Similar Words

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Antonyms & Near Antonyms

as in spiritual

not composed of matter energy is insubstantial

Synonyms & Similar Words

Antonyms & Near Antonyms

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 insubstantial Scarlet’s good intentions to end wars by way of sheer determination to do what’s right might prove insubstantial in practice. — Carlos Aguilar, Los Angeles Times, 6 Feb. 2026 Oliver Rackham, the great historian of the British countryside, devoted a not insubstantial portion of his career to rebutting this claim, noting that there is no evidence whatsoever to suggest that these punishments were ever carried out. — Rosa Lyster, Harpers Magazine, 30 Dec. 2025 And since the lesser and insubstantial always has to give place to the greater and substantial, self-indulgent lust has no choice but to make way for our reflection of pure and perfect Love. — Tony Lobl, Christian Science Monitor, 28 Oct. 2025 These insubstantial claims did not improve much after the European powers departed. — Michael Barnes, Austin American Statesman, 2 July 2025 See All Example Sentences for insubstantial

Recent Examples of Synonyms for insubstantial

Adjective

Roadmaps are frequently high-level and unsubstantial.

— Peter Bendor-Samuel, Forbes.com, 19 June 2026
This can alter the amount and types of ACE-inhibiting peptides created during fermentation2—and possibly account for kombucha's unsubstantial effect on blood pressure.

— MD Published, Verywell Health, 27 Dec. 2025

Definition of unsubstantial

Adjective

This unfettered access — which can be challenging to find among human gurus — is what’s drawing more people to AI for spiritual guidance.

— ABC News, ABC News, 28 Aug. 2026
The now-familiar blend of folk, soul, and psychedelia dominates the album aesthetically, though James took spiritual cues from recordings of meditative organ performances by Alice Coltrane.

— Ryan Leas, Pitchfork, 28 Aug. 2026

Definition of spiritual

Adjective

Unlike other flimsy flip-flops, this style has arch support built into the contoured cork-latex footbed for comfort that lasts well beyond your first few strides.

— Maggie Horton, PEOPLE, 20 Aug. 2026
Luckily for everyone involved, the barriers were the flimsy plastic kind; otherwise, this might’ve ended up being fodder for the World Bollard Association.

— Frank Landymore, Futurism, 19 Aug. 2026

Definition of flimsy

Adjective

Followers of the Abrahamic religions are supposed to treat God as immaterial and incorporeal, yet these early Yahweh worshippers imagined him as fully embodied.

— Manvir Singh, New Yorker, 9 Mar. 2026
Positioned as a large-scale genre event, the series updates the legendary SFX property with a contemporary political and social edge, with Shun Oguri leading the cast as a detective hunting a seemingly incorporeal killer.

— Patrick Brzeski, HollywoodReporter, 27 Jan. 2026

Definition of incorporeal

Adjective

But a gossamer jacket tossed over a swimsuit on a breezy evening?

— Jennifer Noyes, Air Mail, 25 Apr. 2026
The type of memory flashbacks that are shot at knee level, gauzy and out of focus, with a gossamer visual touch to conjure whispering, buried emotions of the past.

— Ryan Lattanzio, IndieWire, 17 Feb. 2026

Definition of gossamer

Adjective

Majdi described his son’s birth in near-metaphysical terms, his own grief as shattering.

— Darrell Smith, Sacbee.com, 20 Aug. 2026
That Dante lived during both the 13th and 14th centuries — and that Tosches’ movements as his novel’s protagonist take place at the start of the 21st century — means nothing in Schnabel’s meta-metaphysical realm.

— A.D. Amorosi, SPIN, 6 Aug. 2026

Definition of metaphysical

Adjective

Over the years, however, the actress has proven herself remarkably versatile, pivoting nimbly from frothy rom-coms and broad comedies to searing dramas, psychological thrillers, and big-budget spectacles.

— Chris Bellamy, Entertainment Weekly, 14 Aug. 2026
Created by showrunner Vivian Lin, the frothy series has more Netflix YA power behind it in Jeff Norton (Geek Girl, Finding Her Edge).

— Dessi Gomez, Deadline, 14 Aug. 2026

Definition of frothy

Adjective

But that doesn’t mean what happens along the way is immaterial.

— Kansas City Star, Kansas City Star, 25 Aug. 2026
So, when companies that used to routinely print tens of billions in annual free cash flow start putting up immaterial sums — or even outflows — investors understandably start to be concerned.

— Zev Fima, CNBC, 6 Aug. 2026