adjective

wicked and cruel.

pirates and their dastardly deeds

wicked,evil,iniquitous,heinous,villainous,diabolical,diabolic,fiendish,vicious,murderous,barbarous,cruel,black,dark,rotten,nefarious,vile,foul,monstrous,shocking,outrageous,atrocious,abominable,reprehensible,despicable,execrable,corrupt,degenerate,reprobate,sordid,depraved,dissolute,bad,base,mean,low,dishonourable,dishonest,unscrupulous,unprincipled,underhand,roguish,crooked,low-down,stinking,dirty,shady,rascally,scoundrelly,beastly,not cricket,malfeasant,egregious,flagitious