Synonyms for Triviality (same or very similar meaning)
WordNet sense 1 (a detail that is considered insignificant):
technicality, trifleWordNet sense 2 (the quality of being unimportant and petty or frivolous):
pettiness, puniness, slightnessWordNet sense 3 (something of small importance):
trivia, small beerFrom the ODE community, based on WordNetadd/edit