Dauntless

Mary was dauntless in the face of Tom's abuse.

Tales of gentleness, of honor, of justice, of courage, of fortitude in suffering, of intrepidity in danger, of dauntless resolution, of iron will, inspire children to an emulation of those virtues.

He may be dauntless when it comes to physical bravery, but he cowers whenever his mother chastises him.

[...] And yet / Dauntless the slug-horn to my lips I set, / And blew "Childe Roland to the Dark Tower came."