Synonyms of 'apace'

amain, decisively, directly, expeditiously, fast, feverishly, forthwith, furiously, helter-skelter, hotfoot, hurriedly, hurry-scurry, immediately, instanter, instantly, lickety-split, pell-mell, post, posthaste, pronto, quick, quickly, right away, right off, slapdash, straightaway, straightway, summarily, superficially