2 Through countries waste, and eke well edified,
waste > desolate, uncultivated eke > also [through countries] edified > built up, built over
3 Seeking adventures hard, to exercise 4 Their puissance, whilom full dernly tried:
puissance > power, strength whilom > formerly; recently full dernly tried > very severely put to the test (this use of "dernly" is SUS)
5 At length they came into a forest wide, 6 Whose hideous horror and sad trembling sound 7 Full grisly seemed: therein they long did ride,
Full > Very, exceedingly grisly > horrible, fearsome
8 Yet tract of living creatures none they found,
tract > track, trace
9 Save bears, lions, and bulls, which roamed them around.
301.15