Definition of do-naught in English:

do-naught

noun

English Regional
archaic
  • A person who does nothing, an idler, a do-nothing; (also) a person who does no good, a good-for-nothing; specifically †the devil (obsolete).

adjective

English Regional
archaic
  • Do-nothingrare.

Origin

Late 16th century; earliest use found in Richard Carew (1555–1620), antiquary and poet. In some forms from do + nought. In some forms from do + naught.

Pronunciation

do-naught

/ˈduːnɔːt/