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insubstantial ( Adjective)
UK/US /ˌɪnsəbˈstænʃl/
Comparative
more insubstantial
Superlative
most insubstantial
1-
C1
not particularly huge, powerful, or influential
-> Their contribution to the group project was insubstantial.
-> Such an insubstantial detail will only hold us back from finishing before the deadline.
-> The evidence presented by the court seemed insubstantial.
Synonym
weak, flimsy
Opposite
substantial
2-
C1
not genuine or authentic
-> Insubstatial foundation of the building caused its demolition.
-> Substantial promises that politicians made turned out to be lies.
-> In dim light, woman's face seemed insubtantial.
Opposite
material