n. changeableness, fickleness, irregularity, mutability, variability, unsteadiness, unsteadfastness, capriciousness, volatility, mercurialness or mercuriality, inconsistency, unreliability; faithlessness, unfaithfulness: How do you deal with inconstancy in one you thought a friend?
INCONSTANCY
Meaning of INCONSTANCY in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012