这把剪刀的刀口很钝，剪不动厚纸板。

The ___blunt-edged scissors can't cut through the cardboard.

这位评论家的文章虽然观点有理有据，但直言不讳的写作风格缺乏冲击力。

The critic's article made valid points, but his ___blunt-edged writing lacked impact.