Defeatist

You can't fight a good fight with such a defeatist attitude.

You can't fight such a defeatist approach.

Do you want this defeatist propaganda to bring about further deterioration of the situation?

You may look ruefully at your poor red hands and think that just because they have got that way through the extra work you are doing there’s just nothing that can be done about it. Of course, this is a deafeatist attitude—and a lazy one too!