Etymology
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painless (adj.)

mid-15c., peineles (adj. and adv.) "suffering no pain; in a painless manner," from pain (n.) + -less. Related: Painlessly; painlessness.

updated on December 11, 2019

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Definitions of painless from WordNet

painless (adj.)
requiring little hard work or exertion;
a painless solution to the problem
painless (adj.)
not causing physical or psychological pain;
painless dentistry
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.