Lewis & Short

ĭn-expertus, a, um, adj., untried (not in Cic. or Cæs.).

  1. I. Act., that has not made trial of, unacquainted with, inexperienced in, unaccustomed to a thing: qui lascivia inexperti advenerant, Tac. A. 16, 5: exercitus bonis inexpertus atque insuetus, Liv. 23, 18, 10: animus ad contumeliam inexpertus, id. 6, 18, 4: dulcis inexpertis cultura potentis amici: expertus metuit, Hor. Ep. 1, 18, 86.
  2. II. Pass., that has not been tried, untried, unproved: legiones civili bello inexpertae, Tac. H. 2, 75; 1, 8: fides, Liv. 28, 18, 10: potestas, id. 3, 52, 9: carmen, new, Stat. S. 4, 5, 11: ne quid inexpertum relinquat, Verg. A. 4, 415; Curt. 3, 6, 5; 4, 4, 2: haud tibi inexpertum curvos deprendere mores, Pers. 3, 52 al.