tristiness--prophetes.ai

† ˈtristiness Obs.
[f. tristy a.¹ + -ness.]
Trustiness, faithfulness.

1408 Clifton tr. Vegetius De re milit. (MS. Digby 233) lf. 185 b/1 Wheþer he haue good tristinesse in knyghthod.

Oxford English Dictionary