Posted by: episystechpubs | December 6, 2012

Editor’s Corner: -able, -ible, and kibble

Today’s topic isn’t a peeve, it’s a helpful hint for people (like me) who mix up the suffixes –able and –ible when playing the spelling guessing game. If you are heartbroken that it isn’t a Thursday quiz—cheer up! At the bottom I’ve included a link from the same site, where you can take two quizzes, if you desire.

From the Purdue OWL (

Rule 1

If the root is not a complete word, add -ible.

aud + ible = audible


  • visible
  • horrible
  • terrible
  • possible
  • edible
  • eligible
  • incredible
  • permissible

Rule 2

If the root is a complete word, add -able.

accept + able = acceptable


  • fashionable
  • laughable
  • suitable
  • dependable
  • comfortable

Rule 3

If the root is a complete word ending in -e, drop the final -e and add -able.

excuse – e+ able = excusable


  • advisable
  • desirable
  • valuable
  • debatable

Some Exceptions

  • contemptible
  • digestible
  • flexible
  • responsible
  • irritable
  • inevitable

If you’re dying for a quiz to check how knowledgeable you are, click here:

And the kibble:

(Photo from:

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