Main Entry: un·sub·stan·tial

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

Function: adjective

Date: 15th century

: not substantial : lacking substance, firmness, or strength <unsubstantial shadows>

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

— un·sub·stan·tial·ly \ˌən-səb-ˈstan(t)-sh(ə-)lē\ adverb