noun
1.
something accepted as true that is actually false or unreal
people who suffer from delusions of persecution
Synonyms: hallucination, ignis fatuus, illusion, mirage, phantasm
Related Word: chicane, chicanery, deception, trickery; cheat, counterfeit, deceit, fake, fraud, humbug, imposture, sham; daydream, dream, fancy, fantasy, figment, vision; apparition, eidolon, ghost, phantom, shade
Antonyms: reality
2.
Synonyms: fallacy 2, casuistry, deception, deceptiveness, equivocation, sophism, sophistry, speciousness, spuriousness
Antonyms: verity