adj.不必要的；无缘无故的
Cut out the paragraph unnecessary for the essay. 删掉论文中不必要的段落。
Critics say, however, that it would create unnecessary new hurdles for users. 批评人士则认为，它会给用户带来不必要的新障碍。
She blushed and stirred her coffee for no reason. 她脸红了，然后又无缘无故的搅动着她的咖啡。
I did not want to be singled out for gratuitous punishment. 我不愿意被叫出来遭受这无缘无故的惩罚。
