Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
self-defeating is an adjective meaning "acting to defeat its own purpose". It carries one recorded sense.
acting to defeat its own purpose
“it is self-defeating...to ignore the progress of events”
Definitions, synonyms and semantic relations for self-defeating come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.