self-defeating

adj

Etymology: From self- + defeating (present participle of defeat).

1. Containing elements that will cause it to fail; destined not to succeed by its very nature.

   “Cutting off your nose to spite your face is self-defeating.”

   “[...] to make commuter operations profitable, a 70 per cent fare rise would be necessary. The president admitted that an increase of this magnitude would be self-defeating and suggested that the commuter himself should not have to bear the whole burden because the service was not exclusively for his benefit, but largely for that of the community concerned.”