Lewis & Short

ĭn -explĭcābĭlis, e, adj., that cannot be unfolded or loosened, inextricable, intricate (class. only in the trop. signif.).

  1. I. Lit.: vinculum, Curt. 3, 1, 13: error viarum, Plin. 36, 13, 19, § 87: laquei, Quint. 5, 10, 101.
    1. B. Transf.: viae continuis imbribus, impassable, Liv. 40, 33, 2.
  2. II. Trop., inexplicable: o rem, inquis, difficilem et inexplicabilem! atqui explicanda est, Cic. Att. 8, 3, 6; 10, 2, 2; 15, 9, 2; id. Ac. 2, 29, 95; 2, 30, 97: facilitas, Liv. 37, 52, 9: ambiguitas, Gell. 14, 2, 3: multitudo, innumerable, Plin. 34, 7, 17, § 37: de generibus singulis disserere immensum et inexplicabile est, impossible, id. 23, 1, 19, § 32: bellum minitari, implacable, Tac. A. 3, 73 (al. inexpiabile).
    Adv.: ĭnexplĭcābĭlĭter, inextricably, inexplicably (post-class.): implicare, Aug. Ep. 255; App. M. 2, p. 115, 21.