durasadam

durāsadam formidable; BG 3.43
durāsadam very difficult to reach; SB 3.8.31
durāsadam difficult to approach; SB 6.10.19-22
durāsadam very difficult to conquer; SB 7.8.19-22
su-durāsadam very difficult to approach (Lord Nṛsiṃhadeva); SB 7.9.1
durāsadam difficult to enter; SB 10.17.8
durāsadām inviolable; SB 10.41.20-23
durāsadam unapproachable; SB 10.76.8