Declan

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The Japanese word

根拠

is pronounced
konkyo | こんきょ
means
foundation
Examples:
その噂はなんの根拠もなかった。
sono uwasa wa nan no konkyo mo nakatta.
The rumor was without foundation.
そのうわさは全く根拠がなかった。
sono uwasa wa mattaku konkyo ga nakatta.
The rumor was completely without foundation.
そのうわさにはなんの根拠もない。
sono uwasa ni wa nan no konkyo mo nai.
The rumor has no foundation.
あなたの意見はまったく根拠がない。
anata no iken wa mattaku konkyo ga nai.
Your idea has no foundation at all.
Examples sourced from tatoeba.org