used to express disbelief of an account or excuse
［表示對(duì)陳述和借口的懷疑］編出來的吧，假的吧
‘She's your lodger? A likely story!’.
“她是你的房客？誰信啊？”。
probably
很可能
I won't take their pills, because as likely as not they'd poison me.
我才不吃他們的藥呢，他們很有可能要毒死我。
(informal)certainly not; I refuse
(非正式)當(dāng)然不，我不干
‘Are you going home?’ ‘Not likely!’.
“你要回家嗎？”“當(dāng)然不！”。