Rigid |
Airtight |
Inflexible. |
Unbreakable |
Unassailable |
Loophole-free |
Like some alibis |
Like a good alibi |
Solid, as an alibi |
Inflexible, as rules |
Rigid, as a contract |
Airtight, as an alibi |
Unbreakable, as a rule |
Civil War fighting ship |
Unbreakable, as a contract |
Difficult to change or break |
Like an inflexible agreement |
Like an unbreakable contract |
Like the Monitor or the Merrimack |
Watertight (deal) or unbreakable (agreement) |