the mind > mental capacity > lack of understanding > foolishness, folly > giddiness, empty-headedness > [noun] > instance of (5)
A foolish or flighty action, etc.
with an and plural. An instance of vacuity or frivolity; an inane remark or practice.
An instance of foolish or silly behaviour; something which is foolish or absurd.
A frivolous act or thing.