Correct spelling


Correct spelling, explanation: the word believable is created by adding the adjective suffix able to the base word believe. In the process, the ending e in believe is removed. There are instances of words where ea stands together (changeable), but generally, if it’s possible it’s more intuitive to let go of the e and this is what happens in most cases similar to this one.

Definition of believable:
1. Realistic, possible to believe, plausible
His explanation was not perfect but it was at least believable.
They felt that his story was not quite believable.

Incorrect spelling


Incorrect spelling, explanation: the form believeable might seem like it makes sense based on the original word and the suffix, but it’s not correct simply because the fewer silent letters – the easier it is to write and more intuitive to read. Considering the fact that the e at the end of believe is silent anyway, it can be deleted.