Definition of "sharpish"

On straights speed would quicken to what was apparently the maximum allowed on this stretch, 140 k.p.h., or 87.5 m.p.h., and then one would see the track disappearing ahead round a sharpish curve, for there are some of 35 and 40 chains' radius on this side of the summit as well.

1960 March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, in Trains Illustrated, page 144