fickleness

noun
1
the fact of changing often and suddenly
ناپایداری, بی‌ثباتی, دمدمی مزاجی
2
the fact of often changing your mind in an unreasonable way so that people cannot rely on you
بی‌ثباتی, دمدمی مزاجی, ناپایداری
the fickleness of young lovers