根こん拠きょ薄はく弱じゃく

na-adjective

unsubstantiated; flimsy; weakly grounded

Describes claims, arguments, or evidence that lack solid support. Often used in formal or critical contexts.

• その告こく発はつは根こん拠きょ薄はく弱じゃくで、証しょう拠こがまったくなかった。

  The accusation was unsubstantiated and had no evidence at all.

• 彼かれの主しゅ張ちょうは根こん拠きょ薄はく弱じゃくだと批ひ判はんされた。

  His argument was criticized as flimsy.