1830 Ld. Tennyson 152 To embattail and to wall about thy cause With ironworded proof.
1896 H. Van Dyke ii. 50 Faith..is to be established by fortification, surrounded and entrenched with banquette and parapet, scarp and ditch and counterscarp of iron-worded proof.
1990 M. McCrory iv. 40 The iron-worded vows ensured that for the rest of their mortal days they would live as nuns.