The young girl shrank from the effort, but the elder lady was inflexible.
Kirkwood smiled grimly, with a face of brass, impenetrable, inflexible.
The baron was inflexible in his resolution not to let Matilda leave the castle.
The worse he grew, the more rigid and inflexible he became in his determination.
I was inflexible; I wouldn't let one of the Morgans into my house.