sickly; unwell.
unsound or troubled: a financially ailing corporation.

1590–1600; ail + -ing2 Unabridged


verb (used with object)
to cause pain, uneasiness, or trouble to.
verb (used without object)
to be unwell; feel pain; be ill: He's been ailing for some time.

before 950; Middle English ail, eilen, Old English eglan to afflict (cognate with Middle Low German egelen annoy, Gothic -agljan), derivative of egle painful; akin to Gothic agls shameful, Sanskrit aghám evil, pain

ale, ail, awl.

1. bother, annoy, distress. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ail (eɪl)
1.  (tr) to trouble; afflict
2.  (intr) to feel unwell
[Old English eglan to trouble, from egle troublesome, painful, related to Gothic agls shameful]

ailing (ˈeɪlɪŋ)
unwell or unsuccessful

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. eglian "to trouble, plague, afflict," from P.Gmc. *azljaz (cf. O.E. egle "hideous, loathsome, troublesome, painful;" Goth. agls "shameful, disgraceful," agliþa "distress, affliction, hardship," us-agljan "to oppress, afflict"), from PIE *agh-lo-, suffixed form of base *agh- "to be depressed,
be afraid." Related: Ailing (c.1600); ailment formed in Eng. 1706.
"It is remarkable, that this word is never used but with some indefinite term, or the word no thing; as What ails him? ... Thus we never say, a fever ails him." [Johnson]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Libraries and university presses are both ailing and desperate.
Doctors have struggled to distinguish the ailing from the malingering.
The killer could be a painkiller commonly fed to ailing livestock.
While those leaders' gifts may not do much to offset ailing budgets, they have
  resonated on their respective campuses.
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