[noun] [C]A triviality is something that is unimportant.I'm a busy man - don't bother me with trivialities.The triviality of something is its lack of importance.The prison sentence seemed rather harsh, considering the triviality of the offence.
TRIVIALITY
Meaning of TRIVIALITY in English
Cambridge English vocab. Кембриджский английский словарь. 2012