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iniquity = "lawlessness"

Matthew 7:23 = (458)
Luke 13:27 = (93)
http://www.biblestudytools.com/OnlineStudyBible/bible.cgi?word=iniquity&section=2&version=str&new=1&oq=iniquity

Psalms 6:8 = (0205)
http://www.biblestudytools.com/OnlineStudyBible/bible.cgi?section=1&showtools=0&version=str&word=iniquity&st=61&sd=0

(458)
1] the condition of without law
  1.a] because ignorant of it
  1.b] because of violating it
2] contempt and violation of law, iniquity, wickedness
derivation: from (459)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=458&version=kjv

(459)
1] destitute of (the Mosaic) law
  1.a] of the Gentiles
2] departing from the law, a violator of the law, lawless, wicked
derivation: from (1) (as a negative particle) and (3551)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=459&version=kjv

(3551)
1] anything established, anything received by usage, a custom, a law, a command
  1.a] of any law whatsoever
      1.a.1] law or rule producing a state approved of God
      1.a.2] by the observance of which is approved of God
      1.a.3]  precept or injunction
  1.b] the rule of action prescribed by reason
  1.c] of the Mosaic law, and referring, acc. to the context. either to the volume of the law or to its contents
  1.d] the Christian religion: the law demanding faith, the moral instruction given by Christ, esp. the precept concerning love
  1.e] the name of the more important part (the Pentateuch), is put for the entire collection of the sacred books of the OT
derivation: from a primary nemo (to parcel out, especially food or grazing to animals)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=3551&version=kjv

(93)
1] injustice, of a judge
2] unrighteousness of heart and life
3] a deed violating law and justice, act of unrighteousness
derivation: from (94)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=93&version=kjv 

(94)
1] descriptive of one who violates or has violated justice
  1.a] unjust
  1.b] unrighteous, sinful
  1.c] of one who deals fraudulently with others, deceitful
derivation: (1) (as a negative particle) and (1349)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=94&version=kjv

(1349)
1] custom, usage
2] right, just
3] a suit at law
4] a judicial hearing, judicial decision, esp. sentence of condemnation
5] execution of a sentence, punishment
  5.a] to suffer punishment
6] the goddess Justice, avenging justice goes to
derivation: probably from (1166)
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=1349&version=kjv

(1166)
1] to show, expose to the eyes
2] metaph.
  2.a] to give evidence or proof of a thing
  2.b] to show by words or teach
derivation: a prolonged form of an obsolete primary of the same meaning
http://www.biblestudytools.com/Lexicons/Greek/grk.cgi?number=1166&version=kjv

(0205)
1] trouble, wickedness, sorrow
  1.a] trouble, sorrow
  1.b] idolatry
  1.c] trouble of iniquity, wickedness
derivation: from an unused root perhaps meaning properly, to pant (hence, to exert oneself, usually in vain)
http://www.biblestudytools.com/Lexicons/Hebrew/heb.cgi?number=0205&version=kjv

Additional information:
The definition in the 1950 edition of "The American College Dictionary", edited by Clarence L. Barnhart, Harper & Brothers, reads:
1. gross injustice; wickedness
2. a violation of right or duty; an unjust or wicked action; a sin.
[ME iniquite, t. L; m.s. iniquitas injustice]

A link to each occurrence of this word in the homepage:
1] iniquity