词根词缀：haust-

【来源及含义】Latin: to draw out, to drink; to draw water, to swallow

【相关词根词缀】 Related "drink" units: bib-; dipso-; nectar-; poto-.

【同源单词】exhaust, exhaustible, exhaustion, exhaustive, exhaustively, exhaustiveness

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