Lewis & Short

scrūpōsus, a, um, adj. [scrupus].

  1. I. Lit., full of sharp or rough stones, jagged, rough, rugged (poet. and in post-class. prose): specus, Att. ap. Non. 223, 2; cf. saxa, Luc. 5, 675; App. M. 6, p. 187, 6: Pyrene, Grat. Cyn. 514: via, Plaut. Capt. 1, 2, 82: ager, App. Flor. 2, p. 348, 20: per asperitates scruposas, Amm. 31, 8, 4.
  2. * II. Trop., rough, hard, arduous: ratio, Lucr. 4, 523.