Lewis & Short

1. in-jussus, a, um, adj. [2. in-jubeo], unbidden, voluntary, of one’s own accord.

  1. I. Lit.: ut numquam inducant animum cantare rogati, injussi numquam desistant, Hor. S. 1, 3, 3: puer, Luc. 7, 38: injussae veniunt ad mulctra capellae, Hor. Epod. 16, 49.
  2. II. Transf., of things: injussaque tela vagantur, that fly from the soldiers’ hands against their will, Luc. 6, 78: injussa virescunt Gramina, spontaneous, Verg. G. 1, 55.