英语词源字典 - 在线词源网站

automatically (adv.)[automatically 词源字典]: 1834, "involuntarily, unconsciously;" see automatic + -ly (2).[automatically etymology, automatically origin, 英语词源]
involuntary (adj.): mid-15c., from Late Latin involuntarius "involuntary," from in- "not, opposite of" (see in- (1)) + Latin voluntarius (see voluntary). Related: Involuntarily.
vegetative (adj.): late 14c., "endowed with the power of growth," from Old French vegetatif "(naturally) growing," from Medieval Latin vegetativus, from vegetat-, past participle stem of vegetare (see vegetable (adj.)). Middle English transferred sense was "characterized by growth." Modern pathological sense of "brain-dead, lacking intellectual activity, mentally inert" is from 1893, via notion of having only such functions which perform involuntarily or unconsciously and thus are likened to the processes of vegetable growth.