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：mors-, mord-

【来源及含义】Latin: bite, biting

【同源单词】mordacious, mordacity, mordancy, mordant, mordent, mordicancy