Is Expeditiously A Word?

Expeditiously - 3 dictionary results
ex·pe·di·tious   /ˌɛkspɪˈdɪʃəs/  Show Spelled[ek-spi-dish-uhs]  Show IPA
–adjective
characterized by promptness; quick: An expeditious answer to an inquiry.
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Origin:
1590–1600; exped(ition) + -itious
 
—Related forms
ex·pe·di·tious·ly, adverb
ex·pe·di·tious·ness, noun
non·ex·pe·di·tious, adjective
non·ex·pe·di·tious·ly, adverb
non·ex·pe·di·tious·ness, noun
un·ex·pe·di·tious, adjective
un·ex·pe·di·tious·ly, adverb
un·ex·pe·di·tious·ness, noun
 
 
—Synonyms
prompt, swift, speedy, fast, rapid.
 
 
—Antonyms
slow, leisurely, deliberate.