by halves
(idiomatic) Partially, incompletely; inadequately, halfheartedly, shoddily.
Not one to do things by halves, Holder’s installation of solar panels, extreme insulation and a biomass boiler fired by locally-sourced woodchips has made the site not merely carbon neutral but carbon positive. Source: Internet
“Jazzland never does anything by halves. Source: Internet
Mao didn't do things by halves. Source: Internet