The word "sparse" means that something is not very crowded or densely packed. It suggests that there is not a lot of something in a given area. Full definition
This data was very sparse in space and time, and was biased towards certain ship tracks and seasons. (climatesight.org)
While I enjoyed it's characters and found it's gameplay fairly solid, I found the game a little sparse on plot with a large focus on dungeon crawling and repetitive quests. (plusxp.com)
There are various different breeds with such hair (probably caused by different genetic mutations), which may be very sparse in some cases. (icatcare.org)