1. (adj) straightaway, straight
a straight segment of a roadway or racecourse
Synonyms: straightaway, heterosexual, heterosexual person, straight, straight person
Antonyms: slow
2. (adverb) immediate, prompt, quick, straightaway
performed with little or no delay
Synonyms: immediate, straightaway, warm, fast, prompt, spry, speedy, ready, agile, nimble, quick, flying, contiguous
Antonyms: slow
3. (adverb) immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot
without delay or hesitation; with no time intervening
Synonyms: now, at one time, straight, at present, like a shot, instantly, instantaneously, in a flash, at once, outright, nowadays, at a time, today, direct, directly, forthwith, promptly, straight off, straightaway, right away, flat, immediately
Antonyms: slow
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Synonyms and Antonyms of straightaway 
