Kevin's self defeating attitude did little to reassure Melanie that he would be in good enough condition to compete in the 5k run next month.
An example of self defeating is when you want to come across as mature, but you start name calling and sticking our your tongue at anyone who doesn't immediately recognize your maturity.
(comparative more self-defeating, superlative most self-defeating)
- Something, such as a plan or action, which contains elements that will cause it to fail.
- Cutting off your nose to spite your face is self-defeating.