undergird
underpin
buttress
vouch
evidence
evidentiate
evidenced
warrant
corroborate
bear out
support
a posteriori
vindicate
flag-waving
underwrite
defend
prove
validate
testify
bear witness
show
countersupport
tell
documentable
uphold
arguable
reason
back
truss
throw one's weight behind
certify
manifest
demonstrate
attest
make for
arguably
speak to
underhold
rest
take someone's part
provenance
take up for
attested
stand behind
stut
justificate
underset
gun
stand
bear
frontlash
justificative
base
vindicatory
justificatory
pedestal
hang one's hat on
sell
run with the hare and hunt with the hounds
you bet
sustain
doubting Thomas
supportive
evidentialist
foundationalist
strengthen
averment
well-founded
evidencer
tenable
corroboratory
collateral
confirmative
take a stand
confirming
establish
substantiative
brace
substantiating
testimonial
testimony
corroborative
in the light of
confirmatory
evidentiary

English words for 'To give fundamental support; provide with a sound or secure basis; provide supportive evidence for.'

As you may have noticed, above you will find words for "To give fundamental support; provide with a sound or secure basis; provide supportive evidence for.". Hover the mouse over the word you'd like to know more about to view its definition. Click search related words by phrase or description. to find a better fitting word. Finally, thanks to ChatGPT, the overall results have been greatly improved.

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