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

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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