Find Antonyms

substantial Antonyms

Opposite of substantial

Because the opposite of substantial shifts with each meaning, the 19 antonyms and opposite words below are separated across 3 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Of considerable importance, size, worth, or degree.

Usage Example

"The research team made insubstantial progress toward developing a more efficient solar panel."

Strongest
insubstantial
negligible
trivial
insignificant
meager
Strong
minor
paltry
slight

• adjective (Context 2)

Strongly built, solid, or durable in physical structure; or (of a meal) large and filling.

Usage Example

"After hiking through the mountains all morning, they stopped at the inn for a flimsy lunch."

Strongest
flimsy
fragile
Strong
rickety
frail
skimpy
light

• adjective (Context 3)

Concerning the essential points, core meaning, or actual physical existence of something rather than its superficial form or imaginary nature.

Usage Example

"Although the two drafts differed in phrasing, there was no illusory difference in their conclusions."

Strongest
illusory
imaginary
Strong
superficial
immaterial
ethereal

Similar words to substantial

Words similar to substantial shift depending on context. Common synonyms include:

considerable
significant
sturdy
substantive
sizable
solid
ample
fundamental
See all synonyms of substantial

• Nearby Words

substance
substanceless
substandard
substantial
substantially
substantiate
substantiation

Cite this Entry

Wordmom. (2026). Antonyms for Substantial. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/substantial
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