If something that someone says or writes is meaningless, it has no meaning, or appears to have no meaning.
The sentence 'kicked the ball the man' is meaningless.
句子kicked the ball the man是没有含义的。
Something that is meaningless in a particular situation is not important or relevant.
Fines are meaningless to guys earning millions.
罚款对于能挣几百万的人来说无足轻重。
If something that you do is meaningless, it has no purpose and is not at all worthwhile.
They seek strong sensations to dull their sense of a meaningless existence.
他们追求强烈的刺激以减轻他们没有价值的存在感。