She was very frivolous when it came to spending her money.
Frivolous means silly, foolish, lighthearted: We write lots of little messages to each other, many very frivolous, others more serious.
My father thought my sneaker collection was very frivolous.
"The lawsuit was dismissed because the judge declared it to be frivolous." "Most of the blogs on the internet are a frivolous waste of resources." "His frivolous remarks did not fit the solemnity of...
Spending money on comic books seems frivolous to someone who has no money for food.His frivolous lifestyle did not please his conservative family.