- castiron
- consistent
- durable
- firmer
- good
- hardened
- hrd
- impregnable
- incorruptibility
- indissoluble
- indurate
- indurative
- infrangible
- proof
- resistant
- robust
- rugged
- secure
- solid
- sound
- stable
- stanch
- steady
- stout
- strong
- sturdy
- su tantial
- substantial
- tight
- tough
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