ˈrüthlə̇s sometimes ˈru̇th- adjective
Etymology: Middle English rewtheles, routheles, rutheles, from rewthe, routhe, ruthe pity, ruth + -les -less
: having no ruth : merciless , pitiless , relentless , unsparing
act of savage, ruthless ferocity — J.A.Froude
savage and ruthless energy in the shedding of innocent blood — Agnes Repplier
ruthless enforcement of the game laws — G.B.Shaw
ruthless disregard for the exhaustibility of the resources they exploited — J.K.Howard
fearless and ruthless honesty in expressing his opinions — F.W.Scott