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：tang-, tact-, tast-, ting-, -tig -tag, -teg-

【来源及含义】Latin: touch, feel; try; reach; handle; evaluate, estimate

【同源单词】anticontagious, atactilia, attain, attainable, attainder, attainment