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substantiate
verb
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How to pronounce substantiate:

Definition of substantiate:

substantiate (verb):
to establish (a story) as genuine
to give substance or form to embody
establish or strengthen as with new evidence or facts.

Synonyms for substantiate:

affirm
attest to
authenticate
back
back up
bear out
confirm
corroborate
demonstrate
document
establish
prove
shew
show
support
sustain
validate
verify
vouch

Antonyms for substantiate:

abandon
abjure
abrogate
abstain
accuse
annul
apostatize
argue against
attack
banish
be at odds with
belie
blow out of the water
blow sky-high
blow up
break
buck
bust
call in question
call into question
cancel
cancel out
challenge
charge
clash with
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Other 3-syllable words

Here are some other common 3-syllable words.

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