If you describe something or someone as unimportant, you mean that they do not have much influence, effect, or value, and are therefore not worth serious consideration. 不重要的
adjective [原级]不重要的;琐碎的
When they had married, six years before, the difference in their ages had seemed unimportant. 他们6年前结婚时,年龄上的差别似乎并不重要。