Sparse means having or containing few, isolated, or scattered elements; not dense. It can also refer to a small number of data points in comparison to the total possible values, resulting in large gaps between them.
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)