too (something) by half
Far too something; more something than is necessary. Used in the form, "too (something) by half." Primarily heard in UK. Liam is too clever by half, winning every debate he gets into. That child is too noisy by half!
too — by half
used to emphasize something bad. British 1994 Independent on Sunday The idea that moving a few pot plants around a room can bring its occupant prosperity and well-being…seems too superstitious by half.