meaning,意义，-less,无，没有。

1. She is fascinated by algebra while he considers it meaningless nonsense.

她对代数非常着迷，而他却认为代数毫无意义。

2. Widespread political and economic disarray threatens to make the constitution meaningless.

四处蔓延的政治和经济混乱可能会使宪法变得可有可无。

3. These tests were so seriously flawed as to render the results meaningless.

这些测试存在严重错误，致使结果变得毫无意义。

4. They seek strong sensations to dull their sense of a meaningless existence.

为了冲淡生活毫无意义的感觉，他们追求强烈的刺激。

5. The sentence "kicked the ball the man" is meaningless.

kickedtheballtheman这句话毫无意义。