Bible Theasaurus

Active (28 instances)
Acute (5 instances)
Energetic (1 instance)
Forcible (3 instances)
Impregnable (2 instances)
Intense (52 instances)
Mighty (576 instances)
Secure (159 instances)
Solid (36 instances)
Stiff (24 instances)
Strong (864 instances)
Substantial (1 instance)
Unassailable (2 instances)

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain