Main Entry: in·sub·stan·tial

Pronunciation: \ˌin(t)-səb-ˈstan(t)-shəl\

Function: adjective

Etymology: probably from French insubstantiel, from Late Latin insubstantialis, from Latin in- + Late Latin substantialis substantial

Date: 1607

: not substantial: as a : lacking substance or material nature b : lacking firmness or solidity : flimsy

— in·sub·stan·ti·al·i·ty \-ˌstan(t)-shē-ˈa-lə-tē\ noun