the relentless pursuit of cost-effective solutions.
The relentless Russian artillery pounding
They vowed not to relent
Trump will not relent
after months of relentless Russian assaults
He has not relented in its attack
relentless: implacable, inexorable, incesante, incansable, imparable, inquebrantable
to relent: volverse menos severo, duro o estricto, normalmente por razones de humanidad. Ceder || ablandarse, suavizarse, ceder || rendirse
unrelenting: constante, continuo, implacable