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What is the opposite of ill-founded?

Need antonyms for ill-founded? Here's a list of opposite words from our thesaurus that you can use instead.

Opposite of not based on fact or reliable evidence
(of ideas, opinion or advice) Able to be trusted due to being valid or well-founded
“I trust his judgment as he has been an unwavering source of reliable advice over many years.”
Accurate, authentic or authoritative in nature
“The data has consistently been proven to be trustworthy.”
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