Definition of painstaker in US English:

painstaker

(also pains taker)

noun

  • A person who takes pains; a painstaking person.

Origin

Late 16th century; earliest use found in Anthony Copley (b. 1567), writer and conspirator. From the plural of pain + taker, after painstaking.

Pronunciation

painstaker

/ˈpeɪnzˌteɪkə/