Reading is not easily explicable.

Fathomable, comprehensible, believable, explicable

"Explicable."

Depending upon context, you could also use something like "intelligible," "amenable," "susceptible," "sensitive," or "responsive" - but all of those would require a strong context and would depend upon how you were using it in a sentence. In any event, "explicable" literally means "capable of being explained" so that is by far the best general word.

Some of the antonyms for the word abysmal are infinite, shallow, slight, comprehensible, explainable, explicable, fathomable, incline, mound, mountain and rise.

There is no scientific evidence that ghosts exist. The things that people have sometimes alleged to be proof of the existence of ghosts are usually explicable by other causes, particularly human psychology.