misspent

[mis-spent]
1.
simple past tense and past participle of misspend.
adjective
2.
spent wrongly or unwisely; wasted: misspent youth.
Dictionary.com Unabridged

misspend

[mis-spend]
verb (used with object), misspent, misspending.
to spend wrongly or unwisely; squander; waste.

Origin:
1350–1400; Middle English. See mis-1, spend

misspender, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
misspend (ˌmɪsˈspɛnd)
 
vb , -spends, -spending, -spent
to spend thoughtlessly or wastefully
 
mis'spender
 
n

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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Etymonline
Word Origin & History

misspend
also mis-spend, "to spend amiss or wastefully," late 14c.; see mis- (1) + spend. Related: Misspent, frequently coupled with youth.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Try not to give the impression your time dressing has been misspent at the
  expense of your work.
They were lifted by insolence above their car loans, their surly arrears, their
  misspent matrimonies.
By one estimate, a fifth of government revenue is pinched, and much of the rest
  misspent.
The huge amounts allocated to foreign aid are either stolen by local
  politicians or misspent by the respective governments.
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