has-been

1. N-COUNT If you describe someone as a has-been, you are indicating in an unkind way that they were important or respected in the past, but they are not now. 過氣的人物[表不滿]

...the so-called experts and various has-beens who foist opinions on us. …那些將想法強(qiáng)加給我們的所謂專家和各類過氣人物。