1 before long, presently, ere long; in the near future, any minute (now), before you know it, in good time, in a little while, in a minute or a moment, momentarily, shortly, anon, in a second, Colloq in a jiffy:
Soon another year will have passed. The doctor will be with you soon.
2 quickly, speedily, at once, promptly, immediately, directly, without delay, straightway, straight away, right away, forthwith, in short order, on the double, in two shakes (of a lamb's tail), in a wink, tout de suite, without delay, Colloq pronto, US and Canadian lickety-split:
If he doesn't come soon, dinner will be spoilt.
3 quickly, speedily, promptly, swiftly:
I'll be there as soon as I can.
4 willingly, lief, gladly, happily, readily:
I'd just as soon be left alone, if you don't mind.
5 sooner or later. at some time or other, some time, one day, in time, in due course, eventually, ultimately, in the end, when all is said and done, at the end of the day, in the last or final analysis, at bottom:
Don't worry, she'll come home sooner or later. Sooner or later they will have to yield.