painless

adj.
Free from complication or pain: a painless operation.

painlessly pain'less·ly adv.
painlessness pain'less·ness n.

Note: click on a word meaning below to see its connections and related words.

The adjective has 3 meanings:

Meaning #1: requiring little hard work or exertion

Meaning #2: not causing physical or psychological pain
  Antonym: painful (meaning #1)

Meaning #3: with as little pain as possible

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中文（繁體）(Chinese (Traditional))
adj. - 無痛的, 不引起痛苦的

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suicide is painless	Painless Plucker Automatic Tweezer