unfounded

根拠のない,事実無根の

unfounded の類語

groundless, false, unsubstantiated, unwarranted, baseless, unsupported, apparent, all in the mind, misleading, without basis, imaginary, idle, delusional, wild, deceptive, self-deceptive, fantastic, unconfirmed, not following, ill-founded, untested, unverified, ostensible, specious, without foundation, phantom, illusive, unreal, not proved, without grounds, spectral, autistic, visionary, seeming, uncorroborated, uncertified, dreamy, erroneous, airy, empty, unsustainable, inconclusive, untenable, unauthenticated, unproven, phantasmagoric, phantasmal, undetermined, not true, illusory, fallacious, dreamlike, unsupported by evidence, untried, self-deluding, vain, in error, chimeric, unreliable, ungrounded

unfounded の反意語

supported, run, confirmed

例文

• That's a completely unfounded rumor.
  それは全く根拠のないうわさです。
• Obviously, the rumour was unfounded.
  もちろん、デマだったよ。

unfounded の言い換えを探すには

unfounded（根拠のない）の類語・言い換え（パラフレーズ）を、日本語訳つきで関連度順に並べています。英作文の語彙を増やしたいとき、長文読解で本文と選択肢の言い換えを見抜きたいときに使えます。