词根词缀：estim-

【来源及含义】Latin: to value; to appraise; to assess

【同源单词】aim, aimless, aimlessly, esteem, estimable, estimableness

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