词根词缀：funct-, fungi-

【来源及含义】Latin: to perform, to execute, to discharge; performance, service, execution

【同源单词】allomeric function, arousal function, bifunctional, cofunction, damage function, defunct

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