meaningless

a. 无意义的

名词:meaninglessness 副词:meaninglessly 

mean.ing.less

adj.（形容词）
Having no meaning or significance.
无意义的，无价值的

【引伸】
mean.inglessly
adv.（副词）
mean.inglessness
n.（名词）
<参考词汇><同义词>meaningless,senseless,mindless,irrational,pointless,purposelessThese adjectives mean lacking import, direction, or purpose.
这些形容词都含有无意义、无方向或无目的意思。
Meaningless andsenseless emphasize absence of meaning, significance, or motivation:
Meaningless 和senseless 强调缺乏意义、重要性或动机：
例句：
a verbose but meaningless explanation;
冗长而无意义的解释；

例句：
senseless violence.
无意义的暴力。

Mindless applies to that which lacks the will and thinking capacity characteristic of a conscious being:
Mindless 用于指缺乏思考能力和意志的：
例句：
.the shrieking of the mindless wind. (John Greenleaf Whittier).
.没头脑的大风的吼叫. （约翰·格林里夫·惠蒂埃）。

例句：
.We must dare to think about ‘unthinkable things’because when things become unthinkable, thinking stops and action becomes mindless. (J. William Fulbright).
.我们必须敢于思考‘不可想的事情’，因为如果事情变得不可想，思想就会停止，行动就会盲目. (J.威廉·富尔布顿特）。

Irrational implies a lack of accord with or a lack of reason or sound judgment:
Irrational 指缺乏理性或良好辨别、判断能力的：
例句：
.It is the function of speech to free men from the bondage of irrational fears. (Louis D. Brandeis).
.是言论的作用使人们从无理性的恐惧中解脱出来. （路易D.布兰代斯）。

Pointless andpurposeless stress the absence of an aim or end:
Pointless 和purposeless 强调没有目的：
例句：
The host bored his guests with a long and pointless anecdote.
主人讲述的冗长而毫无意义的轶闻使客人们都厌倦了。

例句：
She feels that her life is purposeless and empty.
她觉得自己的生活空虚且没有方向