unrelenting

adj

1. Not relenting; not yielding in strength, severity, or determination.

   “There’s faith in their unrelenting woes, / There’s Life in the Old Land yet!”

2. Having no pity; not being or becoming lenient, mild, gentle, or merciful.

   “Tears may not bring again Sardathrion. But this the gods may do who have seen, and seen with unrelenting eyes, the sorrows of ten thousand worlds—thy gods may weep for thee.”