lie

• an untruth; a conscious inversion/perversion of that what is

• bluff
  a false threat or claim intended to deter or deceive someone; an act or instance of bluffing
• craftiness
  skill at gaining an advantage over others, esp. by underhand means; cunning, deviousness.
  also with positive overtones (esp. in later use)
• crookery
  crooked dealings or practices; from crook: "a shepherd's staff, having one end curved or hooked, for catching the hinder leg of a sheep"
• deceit
  the action or practice of deceiving; concealment of the truth in order to mislead; deception, fraud, cheating, false dealing
• deception
  the action of deceiving or cheating
• dishonesty
  the reverse of honesty; lack of probity or integrity; disposition to deceive, defraud, or steal; thievishness; theft, fraud
• double-dealing
  action contradictory to a professed attitude; duplicity
• duplicity
  contradictory doubleness of thought, speech, or action
• fabrication
  a product of fabrication; especially: lie, falsehood
• fakery
  the practice of faking something; deception, trickery, fraud
• falsehood
  an uttered untruth; a lie; also, false statements, uttered untruth, in general
• falseness
  contrariety to fact; want of reality or truth; falsehood, unreality
• falsity
  the quality or condition of being false; contrariety or want of conformity to truth or fact; also an instance of this
• fib
  a trivial or childish lie
• fraud
  deceit, trickery; specifically: intentional perversion of truth in order to induce another to part with something of value or to surrender a legal right
• fraudulence
  the quality or state of being fraudulent (characterized by, based on, or done by fraud)
• guile
  insidious cunning, deceit, treachery
• guilefulness
  the quality of being guileful; deceitfulness; treachery
• half-truth
  a statement that mingles truth and falsehood with deliberate intent to deceive
• hoax
  an act intended to trick or dupe: imposture; something accepted or established by fraud or fabrication
• hypocrisy
  the assuming of a false appearance of virtue or goodness, with dissimulation of real character or inclinations
• lying
  the telling of lies
• mendacity
  the quality of being mendacious; the tendency or disposition to lie or deceive; habitual lying or deceiving; falsehood
• misreport
  a false or incorrect report, esp. of the actions or character of a person
• misrepresentation
  wrong or incorrect representation of facts, statements, the character of a person, etc.; the action of misrepresenting someone or something
• obliquity
  indirectness or deliberate obscurity of speech or conduct
• perfidy
  deceitfulness, untrustworthiness; breach of faith or of a promise; betrayal of trust; treachery
• perjury
  the voluntary violation of an oath or vow either by swearing to what is untrue or by omission to do what has been promised under oath : false swearing
• pretense
  a false, feigned, or hypocritical profession or show, esp. of a quality, emotion, etc.
• propaganda
  the systematic dissemination of information, esp. in a biased or misleading way, in order to promote a particular cause or point of view, often a political agenda. Also: information disseminated in this way; the means or media by which such ideas are disseminated.
• ruse
  a trick, stratagem, or wile
• shenanigan
  trickery, skulduggery, machination, intrigue; teasing, ‘kidding’, nonsense; (usually plural) a plot, a trick, a prank, an exhibition of high spirits
• shiftiness
  the quality or character of being shifty (in various senses of shifty, adj.); (now) esp. evasiveness; furtiveness; dishonesty
• sleight
  deceitful craftiness; also: strategem
• stratagem
  an artifice or trick in war for deceiving and outwitting the enemy; a cleverly contrived trick or scheme for gaining an end; skill in ruses or trickery
• subterfuge
  deception by artifice or stratagem in order to conceal, escape, or evade; a deceptive device or stratagem
• swindle
  the use of deception, trickery, etc., to obtain or take something, esp. money; fraudulent activity of this type.
• treacherousness
  the quality of being treacherous (deceiving, perfidious, false; disloyal, traitorous)
• treachery
  deceit, cheating, perfidy; violation of faith or betrayal of trust; perfidious conduct
• trickery
  the practice of tricks; deceitful conduct or practice; deception, artifice; imposture
• untruth
  falsehood, falsity
• wile
  a crafty, cunning, or deceitful trick; a sly, insidious, or underhand artifice; a stratagem, ruse
• wiliness
  the quality or character of being wily; craftiness, cunning, guile

Above are a few examples, consciously leaving out the (often) more harmless variants, such as act, performance, or playacting, as they don't always make a pretense of their falsity. Illusion is also a different kind of falsity.

• a: an assertion of something known or believed by the speaker or writer to be untrue with intent to deceive
  b: an untrue or inaccurate statement that may or may not be believed true by the speaker or writer
• something that misleads or deceives