ardous {aggettivo}difficile · arduo · scabroso · scabrosa · ardua
ardous {agg.} (anche: difficile, strenuous, challenging, arduous)
ardous {agg.} (anche: strenuous)
archives · archivist · archlet · archway · Arctic · ardency · ardent · ardently · ardor · ardour · ardous · ardously · ardousness · arduous · area · areal · areas · arena · arenaceous · arenose · argent