Open English Wordnet
Nouns
Adjectives
(s)immediate, prompt, quick, straightawayperformed with little or no delay“an immediate reply to my letter”, “a prompt reply”, “was quick to respond”, “a straightaway denial”
Adverbs
(r)immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shotwithout delay or hesitation; with no time intervening“he answered immediately”, “found an answer straightaway”, “an official accused of dishonesty should be suspended forthwith”, “Come here now!”