slipshod
adj
not done or not doing things carefully; careless 不认真的; 粗心的
slipshod work 不经心做的工作
a slipshod style 散漫的作风
a slipshod worker, writer, etc 马虎的工人、 作者等
You're too slipshod about your presentation. 你表达得太不认真.
I suggest that we ask users of this machine what they think about it. We can photograph them using it too. Then we can put their comments at the top of the advertisement in big print. We can bring in some humour too. People enjoy reading humorous ads.