Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Full of speed, fast.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Full of speed (in any sense).

from The Century Dictionary and Cyclopedia

  • Successful; prosperous.
  • Effectual; efficient.
  • Full of speed; hasty; speedy.

Etymologies

speed + -ful (Wiktionary)

Examples

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