verb (used without object)
to form pus; generate purulent matter; suppurate.
to cause ulceration, as a foreign body in the flesh.
to putrefy or rot.
to rankle, as a feeling of resentment.
verb (used with object)
to cause to rankle: Malice festered his spirit.
an ulcer; a rankling sore.
a small, purulent, superficial sore.

1350–1400; (noun) Middle English festir, festre < Anglo-French, Old French festre < Latin fistula fistula (for -l- > -r- cf. chapter); (v.) Middle English festryn, derivative of the noun or < Old French festrir

unfestered, adjective
unfestering, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fester (ˈfɛstə)
1.  to form or cause to form pus
2.  (intr) to become rotten; decay
3.  to become or cause to become bitter, irritated, etc, esp over a long period of time; rankle: resentment festered his imagination
4.  informal (intr) to be idle or inactive
5.  a small ulcer or sore containing pus
[C13: from Old French festre suppurating sore, from Latin: fistula]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., from O.Fr. festre, from L. fistula "pipe, ulcer" (see fistula). The noun is from c.1300. Related: Festered; festering.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fester fes·ter (fěs'tər)
v. fes·tered, fes·ter·ing, fes·ters

  1. To ulcerate.

  2. To form pus; putrefy.

An ulcer.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Diseases might fester because the urinals weren't being washed down with every
He no longer lets little mistakes fester or pouts when the ball doesn't come
  his way.
Letting the problem fester can make raising debt more expensive in the future.
So daft strategies fester rather than getting culled quickly.
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