characterized by promptness; quick: an expeditious answer to an inquiry.

1590–1600; exped(ition) + -itious

expeditiously, adverb
expeditiousness, noun
nonexpeditious, adjective
nonexpeditiously, adverb
nonexpeditiousness, noun
unexpeditious, adjective
unexpeditiously, adverb
unexpeditiousness, noun

prompt, swift, speedy, fast, rapid.

slow, leisurely, deliberate.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
expeditious (ˌɛkspɪˈdɪʃəs)
characterized by or done with speed and efficiency; prompt; quick

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 15c., expedycius "useful, fitting," from L. expeditus, pp. of expidere (see expedite). Meaning "speedy" is from 1590s. Related: Expeditiously.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
For the foreign citizen with no insurance, it was an expeditious way to get the
  needed vaccine.
For a peer-reviewed journal article, you have the right to expect expeditious
  and reasonable peer review.
The big problem is that the orbit speed of fat is again faster, promoting
  expeditious cell division.
The proceedings included the disposition of eight indictments, all of which
  were settled in an expeditious manner.
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