needless

adj. excessive, superfluous; of no use or justification

Adjective
1. unnecessary and unwarranted; "a strikers' tent camp...was burned with needless loss of life"
(synonym) gratuitous, uncalled-for
(similar) unnecessary, unneeded

(a.)
Without sufficient cause; groundless; cuseless.
  

(a.)
Not wanted; unnecessary; not requiste; as, needless labor; needless expenses.
  

(a.)
Having no need.
  

ji4 wang3 bu4 jiu4
It is needless to blame things in the past.
There is no need to blame somebody for past mistakes.

    lessened