" falsity "

1: a false idea or belief;

  * e.g., " ... a papal letter condemning secularism and other movements that the church considered to be falsities of the modern age "

•  Synonyms : 

•  delusion,

•  error,

•  fallacy,

•  falsehood,

•  hallucination,

•  illusion,

•  misbelief,

•  misconception,

•  myth,

•  old wives' tale,

•  untruth

•  Antonyms : 

•  truth,

•  verity

2: a statement known by its maker to be untrue and made in order to deceive;

  * e.g., " ... when questioned by his parents about his drug use, the teenager told one blatant falsity after another "

•  Synonyms : 

•  fable,

•  fabrication,

•  fairy tale,

•  falsehood,

•  fib,

•  lie,

•  mendacity,

•  prevarication,

•  story,

•  tale,

•  taradiddle,

•  untruth,

•  whopper

•  Antonyms : 

•  truth

3: lack of faithfulness especially to one's husband or wife;

  * e.g., " ... the falsity of Guinevere usually figures prominently in medieval and modern tellings of the legend of King Arthur "

•  Synonyms : 

•  disloyalty,

•  faithlessness,

•  falseness,

•  inconstancy,

•  infidelity,

•  perfidiousness,

•  perfidy,

•  unfaithfulness

•  Antonyms : 

•  allegiance,

•  constancy,

•  devotedness,

•  devotion,

•  faith,

•  faithfulness,

•  fealty,

•  fidelity,

•  loyalty