Howard is a_______ boy and he often makes things wrong(carelessly)

Howard is a(careless)boy and he often makes things wrong(carelessly)有原因吗空格处缺少的是形容词，给出的是副词。and 后后面的句子说他经常做错事，应该是说他是一个粗心的男孩。careful 是细心的，careless 是粗心的。