Synonyms of immediately in English:

immediately


See definition of immediately

adverb

1‘it was necessary to make a decision immediately’

SYNONYMS
straight away, at once, right away, right now, instantly, now, directly, promptly, forthwith, that minute, this minute, that very minute, this very minute, that instant, this instant, there and then, here and now, in a flash, without delay, without hesitation, without further ado, post-haste
quickly, as fast as possible, fast, speedily, with all speed, as soon as possible, ASAP
tout de suite
informal before you can say Jack Robinson, pronto, double quick, in double quick time, p.d.q., pretty damn quick, toot sweet
Indian informal ekdam
archaic straightway, instanter, forthright

2‘I sat immediately behind him’

SYNONYMS
directly, right, exactly, precisely, squarely, just, dead
close, closely, at close quarters
informal slap bang
North American informal smack dab