noun

• (uncountable) Deviation from what is right; gross injustice, sin, wickedness.
  "And bycauſe our auncient enemye the Deuyl, who is the well and, ſpryng of iniquitie, and is not onely hymſelfe an homycide, a lyer, and and^([sic]) hater of the truth frõ the beginnyng: [...] Therefore like as we deſyre here to be delyuered from ſynne, ſo also we deſyre, that our heauenly father will ſaue vs, and defende vs from this euil the cauſer of ſynne, that is to ſaye, the Deuyll: [...]"
• (countable) An act of great injustice or unfairness; a sinful or wicked act; an unconscionable deed.
  "For this is an heinous crime, yea, it is an iniquitie to bee puniſhed by the Judges."