There is no hard-and-fast rule. Words with -ible are of Latin origin, so the suffix is no longer being used to create new words; all new coinages use -able (for example, if you're looking to spell the word that means "suitable for being blogged", it would be "bloggable"). However, there are also words of Latin origin that use -able.
One guideline that follows from this is that, if you remove the suffix and are left with a complete word, this generally means that the suffix was spelled -able and not -ible. This doesn't work for all words, though: accessible, contemptible, and flexible are a few of the exceptions.
For more detail see the related link below.
If something is inflexible, then it is not flexible.
-si and -ble are the suffixes of irresponsible
The noun or verb convert can use the suffixes: -ible to form the adjective or noun convertible (adverb convertibly) -ing to form the present participle converting (noun, verb) -er (also -or) to form the noun converter (convertor)
the suffix is ible.
Oh, dude, the word "Bible" doesn't have the suffix "ible." It's actually derived from the Latin word "biblia," which means "books." So, technically, no suffix "ible" in there, but hey, it's all good. Like, who's really keeping track of suffixes anyway, right?
-ible
The current prefix is re-.
If something is inflexible, then it is not flexible.
The adverb form is reasonably. Most adjectives formed by the suffix -able or -ible create the related adverb by changing E to Y (the L is already there).
-si and -ble are the suffixes of irresponsible
The root word is "percept", which means "to see". The "im-" at the beginning is a prefix meaning "not". The suffix is a compound suffix made of "-ible" and "-ly", which shifts the root word from a verb form to an adjective to an adverb.
The suffix of "responsible" is "-ible."
The suffix for "inflexible" is "-ible."
The suffix for access is "-ible."
The suffix of "edible" is "-ible."
Ble.
visible