不了了之 [- - liǎo zhī]settle a matter by leaving it unsettled; smother up; by leaving it unsettled; conclude without a conclusion; end up in [with] nothing definite; conclude without concrete result [decision]; leave it unsettled; let (a matter) take its own course:
•¶ 这个问题很重要, 可他却不了了之。 This is a very important problem, but he just sleeps on it.