straightaway

nouns

a straight segment of a roadway or racecourse
straight, straightaway

adjectives

performed with little or no delay
"an immediate reply to my letter"; "a prompt reply"; "was quick to respond"; "a straightaway denial"
immediate, prompt, quick, straightaway

adverbs

without 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!"
at once, directly, forthwith, immediately, instantly, like a shot, now, right away, straight off, straightaway