1. （指话语、所写内容）意思不明确的，无法理解的，没有意义的
    If something that someone says or writes is meaningless, it has no meaning, or appears to have no meaning.

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    e.g. The sentence 'kicked the ball the man' is meaningless...
           kicked the ball the man 这句话毫无意义。
    e.g. 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. 不重要的;不相关的
    Something that is meaningless in a particular situation is not important or relevant.

    e.g. 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。
    e.g. Fines are meaningless to guys earning millions.
           罚款对挣大钱的人来说无关紧要。

3. 无目的的;无价值的
    If something that you do is meaningless, it has no purpose and is not at all worthwhile.

    e.g. 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。