self-defeating 
adjective
(Of an action) preventing rather than achieving a desired result; futile: courage without wariness is ultimately self-defeating the self-defeating quality of much human behaviour...
- It seems to me that the idea is rather self-defeating.
- Seldom will so much hot air have been expended by so many for such a meanly self-serving and self-defeating result.
- Rather than being self-defeating, successful players are their own best friends.
Rhymes
- prisoners-of-war camp
- prison fever
- prison-free
- prisonful
- prison gate
- prison-gray
- prison-grey
- prison haircut
- prison hole
- prison-house
- prison industry
- prisonise
- prisonised
- prison island
- prison isle
- prisonization
- prisonize
- prisonized
- prison keeper
- prison mate
- prison matron
- prison officer
- prisonous
- prisonscape
- prison sentence