IPA: /ˈfɔɪləbəl/
KK: /ˈfɔɪləbəl/
Able to be prevented from succeeding or stopped.
The plan was foilable, and the team quickly found a way to stop it.
Foilable → It is formed from "foil" (from Old French *foiler*, meaning to thwart or defeat) and "-able" (meaning capable of). The word "foilable" means capable of being thwarted or defeated.
Think of something that can be 'thwarted' or 'defeated' — that's what 'foilable' means, as it describes something that can be foiled.