(as) daft as a brush

: silly, foolish

: mad, insane

: frivolously merry

: brushwood

: scrub vegetation

: land covered with scrub vegetation

: a device composed of bristles typically set into a handle and used especially for sweeping, smoothing, scrubbing, or painting

: something resembling a brush: such as

: a bushy tail

: to apply a brush to

: to apply with a brush

: to remove with passing strokes (as of a brush)

: a brief encounter or skirmish

: to move lightly or heedlessly