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Definitions

substantial

[suhb-stan-shuhl] / səbˈstæn ʃəl /
ADJECTIVE
important, ample
Synonyms
STRONGEST
big consequential considerable extraordinary generous hefty large massive meaningful serious significant sizable solid steady strong valuable vast
STRONG
material
WEAK
abundant big-deal bulky durable firm goodly heavy heavyweight key major-league momentous plentiful principal sound stable stout sturdy superabundant tidy weighty well-built worthwhile
Antonyms
STRONGEST
broken inconsiderable insignificant intermittent little meaningless miniature minor selfish slight small soft tiny trivial unimportant untrustworthy useless weak worthless
WEAK
ethereal impoverished mental poor spiritual unsubstantial
ADJECTIVE
material, real
Synonyms
STRONGEST
actual material positive real solid
WEAK
card-carrying concrete corporeal existent for real honest-to-God honest-to-goodness legit objective phenomenal physical righteous sensible sure-enough tangible true valid visible weighty
Antonyms
WEAK
ethereal impoverished insignificant little mental minor poor small spiritual unimportant unsubstantial
ADJECTIVE
rich
Synonyms
STRONGEST
solid
WEAK
affluent comfortable easy opulent prosperous snug solvent wealthy well well-heeled well-off well-to-do
Antonyms
WEAK
ethereal impoverished insignificant little mental minor poor small spiritual unimportant unsubstantial

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The criminal case follows a 2023 civil defamation case, in which a judge found - on the balance of probabilities - there was "substantial truth" to some of the murder claims against Roberts-Smith.

From BBC • Apr. 16, 2026

During his tenure, Hastings oversaw the substantial growth of the streaming colossus.

From Los Angeles Times • Apr. 16, 2026

Americans with high incomes and substantial savings tend to file closer to April 15.

From The Wall Street Journal • Apr. 15, 2026

Moreover, London-headquartered Eurizon SLJ has observed a boom in export profitability and a substantial buildup in household savings that may be released from bonds, currently yielding only 1.8%

From MarketWatch • Apr. 14, 2026

Lunch of soup, bread and jam, and cocoa was at 1:00 P.M., tea was at 4:00 P.M., and dinner, the most substantial meal of the day, was at 6:00 P.M.

From "Shipwreck at the Bottom of the World" by Jennifer Armstrong

Vocabulary lists containing substantial

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