Collocations for fast - adj., adv.

be, seem
Her pulse seemed very fast.

exceptionally, extremely, really, remarkably, surprisingly, very
I should make a very fast profit on these.

a bit, fairly, a little, pretty, quite, reasonably, relatively
I suppose delivery in two days is quite fast really.

amazingly, blindingly, incredibly, unbelievably
He came round the corner blindingly fast.

dangerously