Wiktionary
unslackened
a. Not slackened.
Usage examples of "unslackened".
Still as the day wears on, the same process of yarding up, catching, and cropping proceeds with unslackened speed.
And still the quartz-crushing machine, with its ruthless ceaseless stampers, went thundering on from mid-day to midnight, unchecked, unslackened, still keeping up the same hungry sullen roar, as of a troop of lions.