frivolous
FRIV-uh-lusadjMeaning not serious; silly or not worth taking seriously
Memory hook FRIVOL-ous: FRILLY and SILLY. Victor buys his cat a tiny jeweled crown and a velvet throne. Frilly, silly and not needed at all: the purchases are frivolous.
Grandpa thought buying a hat for the dog was frivolous, but the dog loved it.
In context With only twenty dollars left for groceries, Mom said that spending ten on balloons would be frivolous, so we drew decorations instead.
Similar silly, trivial, foolish, flippant
Opposite serious, important, sensible
From Latin frivolus, “silly, worthless.”