Insubstantial lacking firmness or solidity; weak or unsatisfying

不牢固的；脆弱的；薄弱的

The bridge looked insubstantial and unsafe.

这座桥看起来不坚固且不安全。

The evidence presented in court was insubstantial.

在法庭上出示的证据不坚固。

His arguments were insubstantial and failed to convince anyone.

他的论点不坚固，未能说服任何人。

The walls of the old house felt insubstantial to the touch.

这座老房子的墙摸起来不坚固。

The fabric of the dress was so thin it seemed insubstantial.

这件连衣裙的布料非常薄，显得不坚固。

An insubstantial argument, accusation, claim, etc

无真凭实据的争论、指控、索赔要求等。

His world is, on the whole, made wonderfully interesting. but it is insubstantial .

他的世界大体说来写得非常有趣。但是虚构的。

A proton is an infinitesimal part of an atom, which is itself of course an insubstantial thing.

质子是原子极其微小的组成部分，而原子本身当然也小不可言。

Water also is insubstantial; by that I mean you cannot grasp hold of it, you cannot punch it and hurt it.

水也是没有实体的，这样说是指你无法抓住水，你无法击打它、伤害它。