unbrookable

From un- +‎ brook +‎ -able.

unbrookable (comparative more unbrookable, superlative most unbrookable)

1. Not to be brooked or borne; intolerable.
   • 1844, The Knickerbocker: Or, New-York Monthly Magazine:

     Having keenly felt the degradation of his race, and possibly experienced some outrageous act of injustice, or an unbrookable and unforgivable insult, his flashing eyes are immoveably directed toward the King […]

• unbrookably