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Related to Achilles heel: heel pain
a small but fatal weakness
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
(or Achil′les') heel′,
a vulnerable point.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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noun weakness, failing, lack, fault, defect, deficiency, flaw, shortcoming, blemish, imperfection, chink in your armour His Achilles heel was that he could not delegate.
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002