IPA: /ˈɡɛsəbl/
KK: /ˈɡɛsəbl/
Able to be figured out or predicted without much information.
The answer to the riddle was guessable if you thought about it carefully.
Guessable → It is formed from "guess" (from Old English *gēosan*, meaning to think or suppose) and "-able" (meaning capable of). The word "guessable" means capable of being guessed or thought of.
Think of the word 'guess' which means to think or suppose, and remember that 'guessable' refers to something that can be thought of or guessed.