slightness vs triviality

slightness and triviality both are nouns.

Word	Noun	Adjective	Verb	Adverb
slightness	Yes	No	No	No
triviality	Yes	No	No	No

As nouns, slightness and triviality are synonyms defined as:

slightness and triviality: the quality of being unimportant and petty or frivolous

Other synonyms of slightness include pettiness, puniness.

slightness (noun)	triviality (noun)
slenderness	something of small importance
the property of an attractively thin person	the quality of being unimportant and petty or frivolous
the quality of being unimportant and petty or frivolous	a detail that is considered insignificant