1. (the quality of being unimportant and petty or frivolous)
pettiness, triviality, slightness, puniness
synonim: błahość
synonim: bzdurność

2. (mild mental retardation)
moronity, mental deficiency: : synonim: debilność
synonim: durnowatość

3.
stupidity: : synonim: idiotyczność