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. 过气的人物[表不满]

...the so-called experts and various has-beens who foist opinions on us. …那些将想法强加给我们的所谓专家和各类过气人物。