of very bad quality 劣质的；低劣的；糟糕的
Most of his songs are pretty crummy.
他的歌曲大多糟糕透顶。
crumb → crumby
a very small piece of food, especially of bread or cake, that has fallen off a larger piece 食物碎屑；（尤指）面包屑，糕饼屑
She stood up and brushed the crumbs from her sweater.
她站起身掸掉了毛衣上的面包屑。