1. 不大的;不坚固的;脆弱的
Something that is insubstantial is not large, solid, or strong.
1. lacking material form or substance
unreal
e.g. as insubstantial as a dream
an insubstantial mirage on the horizon
Synonym: unsubstantialunreal
2. lacking in nutritive value
e.g. the jejune diets of the very poor
Synonym: jejune