characterized by, guilty of, or full of sin; wicked: a sinful life.

before 900; Middle English; Old English synfull. See sin1, -ful

sinfully, adverb
sinfulness, noun
unsinful, adjective
unsinfully, adverb
unsinfulness, noun

iniquitous, depraved, evil, immoral, corrupt. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sinful (ˈsɪnfʊl)
1.  having committed or tending to commit sin: a sinful person
2.  characterized by or being a sin: a sinful act

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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Example sentences
There is little or nothing you can do besides recognize your sinful nature and
  spread the news to as many as will hear it.
Critical thinking is discouraged being called prideful or sinful or rebellious.
Of course religious leaders have a right to speak and lobby against whatever
  they consider sinful.
They exaggerate how sinful they were before they were born again.
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