too something by half
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 halfused 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.