unreliableadj.不可靠的
unrelatedadj.不相关的;无亲属关系的
unrelentinglyadv.无情地
unrelentingnessn.不宽恕
unrelenting effort百折不挠的努力
unrelenting struggle不屈不挠的斗争
unrelenting pressure无情的压力
unrelenting perseverance不屈不挠的毅力
unrelenting criticism/pressure持续不断的批评/压力
"grim determination"
"grim necessity"
"Russia's final hour, it seemed, approached with inexorable certainty"
"relentless persecution"
"the stern demands of parenthood"
"the brutal summer sun"
"a brutal winter"
"the relentless beat of the drums"