Cadmean victories refer to victories which come with a severe cost or disastrous consequences. There are several synonyms that can be used for them. The first one is Pyrrhic victory, which refers to a win which ultimately leads to immense losses. Another synonym is a hollow victory, which describes a triumph that feels empty or meaningless. A third synonym is a triumph at any cost, which refers to a victory that is achieved no matter what sacrifices are made. Lastly, a bittersweet victory is a success which is marred with mixed emotions - happiness for the win, but sadness for the losses suffered along the way. All these synonyms describe victories which come with a heavy price.