1. falsity, falseness, unreality, irreality

usage: the state of being false or untrue; "argument could not determine its truth or falsity"

2. faithlessness, falseness, fickleness, inconstancy, infidelity, unfaithfulness

usage: unfaithfulness by virtue of being unreliable or treacherous

3. insincerity, falseness, hollowness, untruthfulness

usage: the quality of not being open or truthful; deceitful or hypocritical

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