pain·less /ˈpenləs/ 形容詞
無痛的
Pain·less a. Free from pain; without pain. -- Pain*less*ly, adv. -- Pain*less*ness, n.
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painless
adj 1: requiring little hard work or exertion; "a painless solution
to the problem"
2: not causing physical or psychological pain; "painless
dentistry" [ant: painful]
3: with as little pain as possible; "a humanely painless
killing"