A groundless fear, rumour, or accusation is not based on facts or good reason. There is nothing solid under it.

A groundless fear, rumour, or accusation一個groundless的恐懼、謠言、或指控 is not based on facts or good reason不是根據事實或合理原因而來的。There is nothing solid under it它底下沒有任何紮實的根據。

Ground here is not dirt; it is the older idea of a base or a reason, the same as grounds for a complaint.

Ground here這裡的ground is not dirt不是指泥土；it is the older idea of a base or a reason而是比較舊的用法，指基礎或理由，the same as grounds for a complaint就跟grounds for a complaint（抱怨的理由）裡的用法一樣。

If a claim is groundless, you can ignore it, or you should stop worrying. The word is a little formal — you meet it in news, school essays, and careful speech more than in chat.

If a claim is groundless如果一個說法是groundless的，you can ignore it你可以不理它，or you should stop worrying或是你該停止擔心。The word is a little formal這個字有點正式——you meet it你會 in news, school essays, and careful speech在新聞、學校作文、和謹慎的言談裡遇到它，more than in chat而不太會在聊天中出現。

Though actually, people sometimes say groundless when they only mean “I disagree,” which is looser than “there is no evidence.” It is the opposite of well-founded. Do not mix it up with grounded, which can mean “sensible,” “punished and not allowed out,” or “connected to the earth” in electricity.

Though actually不過其實，people sometimes say groundless有時人們說groundless when they only mean "I disagree,"其實只是想說「我不同意」，which is looser than "there is no evidence."這比「沒有證據」的意思更寬鬆。It is the opposite of well-founded它是well-founded（有根據的）的反義詞。Do not mix it up with grounded不要把它跟grounded搞混，which can mean "sensible,"grounded可以指「務實的」、"punished and not allowed out,"「被禁足、不准出門」、or "connected to the earth" in electricity或在電學裡指「接地的」。