as thin as a rake
extremely thin
as smooth as silk
very smooth
as bright as a button
very intelligent
as thick as two short planks
remarkably stupid
as fresh as a daisy
extremely fresh and full of energy
ran like the wind
ran extremely fast
drive like a maniac
drive fast and badly
fit like a glove
to fit perfectly
as clear as crystal
Very easy to understand/ easy to see
as poor as a church mouse
extremely poor