of the nature of or involving crime.
guilty of crime.
Law. of or pertaining to crime or its punishment: a criminal proceeding.
senseless; foolish: It's criminal to waste so much good food.
exorbitant; grossly overpriced: They charge absolutely criminal prices.
a person guilty or convicted of a crime.

1350–1400; Middle English < Anglo-French < Late Latin crīminālis, equivalent to Latin crīmin- (stem of crīmen; see crime) + -ālis -al1

criminally, adverb
noncriminal, adjective, noun
noncriminally, adverb
quasi-criminal, adjective
quasi-criminally, adverb
subcriminal, adjective
subcriminally, adverb
supercriminal, adjective, noun
supercriminally, adverb
uncriminal, adjective
uncriminally, adverb

1. felonious, unlawful. See illegal. 6. malefactor, evildoer, transgressor, culprit, felon, crook, hoodlum, gangster.

1. lawful. 2. innocent. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To criminal
World English Dictionary
criminal (ˈkrɪmɪnəl)
1.  a person charged with and convicted of crime
2.  a person who commits crimes for a living
3.  of, involving, or guilty of crime
4.  (prenominal) of or relating to crime or its punishment: criminal court; criminal lawyer
5.  informal senseless or deplorable: a criminal waste of money
[C15: from Late Latin crīminālis; see crime, -al1]

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

early 15c. (adj.), from Fr. criminel (11c.), from L. criminalis, from L. crimen (gen. criminis); see crime, preserving the Latin -n-. As a noun, from 1620s. Criminal law (or criminal justice) distinguished from civil in English at least since late 15c.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Reintroducing criminal animal cruelty laws would change how corporations make
  decisions in farm and factory practices.
Juries can decide the facts in criminal and civil cases.
On top of that, capital punishment is extremely costly to administer and has
  never been shown to deter criminal behavior.
Antisocial or criminal behavior may stem from damage to the part of the brain
  that governs moral reasoning.
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