Lewis & Short

insĭtīvus, a, um, adj. [1. insero], ingrafted, grafted (poet. and post-Aug.).

  1. I. Lit.: pira, Hor. Epod. 2, 19.
  2. II. Trop., substituted, spurious: liberi, Phaedr. 3, 3, 10: heres, adopted, Sen. Contr. 2, 8: alimentum lactis, of another person than the mother, Gell. 12, 1, 17.
    Plur. n. as subst.: insitiva virtutum, Ambros. Ep. 2, 8.