Answer: ironclad

AnswerCrossword Clue
IRONCLAD

Like the "Monitor" or the "Merrimac"

IRONCLAD

Unbreakable

IRONCLAD

Civil War fighting ship

IRONCLAD
Unbreakable, as a contract
IRONCLAD
Like an inflexible agreement
IRONCLADRigid, as a contract
IRONCLADLike a good alibi
IRONCLADLacking loopholes
IRONCLADLike some alibis
IRONCLADLike the Monitor or the Merrimack
IRONCLADAirtight, as an alibi
IRONCLADArmor-plated
IRONCLADInflexible
IRONCLADWithout loopholes
IRONCLADSolid, in a sense
IRONCLADUnbreakable, as a lease.
IRONCLADKind of alibi.
IRONCLADDifficult to change or break
IRONCLADAirtight
IRONCLADUnbreakable, as a rule
IRONCLADRigid
IRONCLADLike the "Constitution"?