doubly

[duhb-lee]
adverb
1.
to a double measure or degree: to be doubly cautious.
2.
in a double manner.
3.
Obsolete. with duplicity.

Origin:
1350–1400; Middle English; see double, -ly

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World English Dictionary
doubly (ˈdʌblɪ)
 
adv
1.  to or in a double degree, quantity, or measure: doubly careful
2.  in two ways: doubly wrong

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

doubly
late 14c., from double + -ly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In some cases, the paper engineer proves to be doubly talented and serves as
  the illustrator as well.
The angled fold-over flap is doubly secured with a magnetic clasp.
He and others have been investigating how these ecosystems function so that
  efforts to prevent damage can be doubly effective.
He was doubly anxious sorting out his kit as he got into the boat.
Synonyms
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