1‘it was necessary to make a decision immediately’
straight away, at once, right away, right now, instantly, now, directly, promptly, forthwith, this/that, 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, a.s.a.p.
tout de suite
informal before you can say Jack Robinson, pronto, double quick, in double quick time, toot sweet
Indian informal ekdam
archaic straightway, instanter, forthright
2‘I sat immediately behind him’
directly, right, exactly, precisely, squarely, just, dead
close, closely, at close quarters
informal slap bang
North American informal smack dab
We take a look at several popular, though confusing, punctuation marks.