Synonyms of post-haste in English:


See definition of post-haste


1‘he departed post-haste for Venice’

as quickly as possible, as soon as possible, ASAP, without delay, quickly, very quickly, speedily, swiftly, without further ado, without more ado, with all speed, promptly, immediately, at once, straight away, right away, directly, forthwith
informal double quick, p.d.q., pretty damn quick, pronto, before you can say Jack Robinson, straight off
archaic straight, instanter