Self-defeating (adjective)

Tending to defeat or undermine one's own goals or interests.

Origin:

Combination of self and defeating, meaning tending to defeat or undermine one's own goals or interests.

Examples:

1. His tendency to procrastinate was self-defeating and prevented him from achieving his goals.
2. Her self-defeating attitude made it difficult for her to succeed.
3. His self-defeating behavior led to his own downfall.
4. The self-defeating comments she made undermined her own credibility.
5. The self-defeating attitude he had towards himself was preventing him from reaching his full potential.