straightaway

(noun) a straight segment of a roadway or racecourse. Synonyms: straight.

(adj) performed with little or no delay. Synonyms: immediate, prompt, quick. Examples: "An immediate reply to my letter." "A prompt reply." "Was quick to respond." "A straightaway denial."

(adv) without delay or hesitation; with no time intervening. Synonyms: immediately, instantly, straight off, directly, now, right away, at once, forthwith, like a shot. Examples: "He answered immediately." "Found an answer straightaway." "An official accused of dishonesty should be suspended forthwith." "Come here now!."