chasmy

adj

1. Of, pertaining to, or resembling a chasm.

   “They cross the chasmy torrent's foam-lit bed, / Rocked on the dizzy larch's narrow tread; […]”

   “North-eastward, at the extreme right, or Elbe point of it, where Grüne and the Austrians stand, it has grown so chasmy, we judge that Grüne can neither advance nor be advanced upon: so we leave him standing there,—which he did all day, in a purely meditative posture.”