a. 脆弱的, 无实体的, 非实质的
adj. 脆弱的；无实体的；幻想的，非真实的
insubstantial 非实体的，不坚固的
in-,不，非，substantial,结实的，牢固的，实体的。
1、an insubstantial argument.
不充实的论据
2、insubstantial pathogens disturbing the chest and diaphragm
无形之邪扰胸膈
3、an insubstantial construction of wood and glue
用木头和胶粘合的简单构造
4、Her limbs were insubstantial, almost transparent.
她的四肢非常纤细，几乎是透明的。
5、The rest were an insubstantial pageant.
其余的人都不过是华而不实的过眼烟云罢了。
6、Something that is airy， insubstantial， or passing.
过眼烟云虚幻的，不现实的或短暂存在的东西
7、Obama brushes aside the notion that his rhetoric insubstantial.
欧巴马漠视了说他修辞没有实质的观念。
8、Void namely does not have the solid content, the insubstantial meaning.
空虚即无实在内容, 不充实的意思。
9、Obama brushes aside the notion that his rhetoric is insubstantial.
奥巴马漠视了说他修辞没有实质的观念。
10、Early aircraft were insubstantial constructions of wood and glue.
早期得飞行器是木头和胶粘合得脆弱机器。