Lewis & Short

1. in-testābĭlis, e, adj., that is incapable, by reason of misconduct, of being a witness or of making a will.

  1. I. Lit.: si quis ob carmen famosum damnetur, senatusconsulto expressum est, ut intestabilis sit, ergo nec testamentum facere poterit, nec ad testamentum adhiberi testis, Dig. 28, 1, 18.
  2. II. Transf.
    1. A. Infamous, execrable, detestable, abominable: homo, Sall. J. 67 fin.; Hor. S. 2, 3, 181; Tac. A. 6, 40: intestabilis et sacer esto, Hor. S. 2, 3, 81.
      Comp., Sall. H. Fragm. 1, 41, 1; Tac. H. 4, 42 fin.
    2. B. Of things: ars magica, Plin. 30, 2, 6, § 7: saevitia, Tac. A. 6, 51.