Painless comes from pain + the privative suffix -less. Pain derives via Old French peine from Latin poena 'penalty', from Greek poinē. The suffix is part of the word's derivational shape, marking the final grammatical or semantic role while the base supplies the central meaning. As an adjective, it carries the sense "causing no pain; involving little effort or difficulty", with the older formation still helping explain the modern use. Relevant historical forms include Old French peine and Latin poena. Derivative forms include painlessly, painlessness; related words include pain, painful, pained.