词根词缀：-less

【来源及含义】Old English: -leas, from leas, "free from, devoid of, false, feigned"; suffix meaning "lacking"

【同源单词】aimless, artless, avoidless, causeless, ceaseless, charmless

词根词缀：piet-, pious-

【来源及含义】Latin: from pius, dutiful, dutiful conduct; kind, kindness; devout; compassion

【同源单词】expiable, expiate, expiation, expiatory, impiety, impious