insubstantial

insubstantial /ˌɪnsəbˈstænʃəl/ adjective
insubstantial
/ˌɪnsəbˈstænʃəl/
adjective
Britannica Dictionary definition of INSUBSTANTIAL
[more insubstantial; most insubstantial]
: not substantial: such as
a  : not large or important
b  : not strong or solid
c  : not real : not made of a real substance

— insubstantiality

/ˌɪnsəbˌstænʃiˈæləti/ noun [noncount]