名詞 straightaway:

1. a straight segment of a roadway or racecourse
   同義詞：straight

形容詞 straightaway:

1. performed with little or no delay
   同義詞：immediate, prompt, quick

副詞 straightaway:

1. without delay or hesitation; with no time intervening
   同義詞：immediately, instantly, straight off, directly, now, right away, at once, forthwith, in real time, like a shot