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Definitions

substantiate

[suhb-stan-shee-eyt] / səbˈstæn ʃiˌeɪt /
VERB
back up a statement, idea
Synonyms
STRONGEST
affirm confirm corroborate debunk demonstrate justify prove ratify validate verify
STRONG
actualize approve authenticate complete establish incarnate manifest materialize objectify personify realize reify support test try
WEAK
attest to bear out check out check up try on try out
Antonyms
STRONGEST
contradict deny discredit disprove invalidate reject veto
STRONG
disapprove ignore neglect oppose refuse
WEAK
break

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.

Pressed again about the IDF's comments, he said: "There is no assessment to substantiate what's being said."

From BBC • Mar. 22, 2026

The education website The 74 reported that during the bankruptcy hearing, Toby Jackson, AllHere’s former chief technology officer, said he had no invoices to substantiate the debt.

From Los Angeles Times • Mar. 1, 2026

The ECB has been unable to substantiate the BBC allegations, but former England captain Vaughan called for the governing body to investigate the issue thoroughly.

From Barron's • Feb. 21, 2026

It is not much more than a piece of paper generated in a self-serving way by ICE, free of review to substantiate what is stated in it.

From Salon • Jan. 23, 2026

White hadn’t been able to substantiate Kenny’s allegations, but he wasn’t sure what to make of Comstock, either.

From "Killers of the Flower Moon" by David Grann