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Webster 1913 Edition

adv.

In a prompt manner.

adv.

Readily; quickly; expeditiously; cheerfully.

promptly ‎(comparative more promptly, superlative most promptly)

In prompt manner; both soon and quickly.
- 1945 May, George Orwell, chapter 1, in Animal Farm: A Fairy Story, London: Secker & Warburg, OCLC 3655473:
  
  […] the ducklings nestled down inside it and promptly fell asleep.

in a prompt manner