weakly

[week-lee]
adjective, weaklier, weakliest.
1.
weak or feeble in constitution; not robust; sickly.
adverb
2.
in a weak manner.

Origin:
1350–1400; Middle English weekely. See weak, -ly

weakliness, noun


1. See weak.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
weakly (ˈwiːklɪ)
 
adj , -lier, -liest
1.  sickly; feeble
 
adv
2.  in a weak or feeble manner
 
'weakliness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The dark matter is hallow and weakly react with any other matter.
Clumping of dark matter could be resisted due to it weakly interacting with
  itself.
Private credit demand is likely to rebound only weakly as households restore
  their balance sheets.
Output is sluggish and credit is growing weakly or shrinking across much of the
  rich world.
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