needless

形容词 needless:

1. unnecessary and unwarranted
   同义词：gratuitous, uncalled-for

1. He got a large fortune when his father died, but trifled it away in only a few years of needless spending.
   父亲去世时他得到一大笔财产，可仅仅几年的时间就将这笔钱胡乱挥霍一空。
2. Needless to say, learning without thinking is useless.
   不用说，学而不思则罔。
3. Needless to say, he kept his promise.
   不用说，他信守了他的诺言。

need.less

adj.（形容词）
Not needed or wished for; unnecessary.
不需要的：不需要的，不想要的；不必要的

【引伸】
need.lessly
adv.（副词）
need.lessness
n.（名词）