carelessly,

仔细地 carefully→adj. 粗心的 careless→adv.粗心地 carelessly 6.
新概念三册11课课文详解~~~~ do not use time or words carelessly
why is it dangerous to drop litter / rubbish carelessly?
carelessly 粗心的 adj.________ careless adv.
carelessly 粗心的 adj.________ adv.