英语词源字典 - 在线词源网站

insubstantial (adj.)[insubstantial 词源字典]: c. 1600, from Medieval Latin insubstantialis, from in- "not" (see in- (1)) + substantialis (see substantial). Related: Insubstantially.[insubstantial etymology, insubstantial origin, 英语词源]
substantial (adj.): mid-14c., "ample, sizeable," from Old French substantiel (13c.) and directly from Latin substantialis "having substance or reality, material," in Late Latin "pertaining to the substance or essence," from substantia "being, essence, material"(see substance). Meaning "existing, having real existence" is from late 14c. Meaning "involving an essential part or point" is early 15c. Related: Substantially.
variant (n.): :something substantially the same, but in different form," 1848, from variant (adj.).