IPA: /dɪˈfiːtəbl/
KK: /dɪˈfiːtəbl/
Able to be beaten or overcome in a competition or conflict.
The team was confident that they were not defeatable this season.
Defeatable is formed from "defeat" (from Old French *defait*, meaning to overcome or vanquish) and "-able" (meaning capable of). The word "defeatable" means capable of being overcome or vanquished.
Think of something that can be 'overcome' ('defeat') and is 'capable of' ('-able') being beaten. This helps you remember that 'defeatable' refers to something that can be defeated.