IPA: /fərˈɡɛtəbl/
KK: /fərˈɡɛtəbl/
Something that is easy to forget or not memorable.
The movie was so forgettable that I can't even remember the plot.
Comparative: more forgettable
Superlative: most forgettable
Forgettable → It is formed from "forget" (from Old English *forgietan*, meaning to lose the memory of) and "-able" (meaning capable of being). The word "forgettable" means capable of being forgotten or not worth remembering.
Think of something that is "capable of being lost from memory" — that's what forgettable means.