Less dense

• Less abundant
• Not as dense
• Less populated
• Like the population of Alaska vis-Г -vis New Jersey
• More thinly distributed
• It's not so plentiful in sister's analysis
• More empty
• Thinner

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Sparse \Sparse\, a. [Compar. Sparser ; superl. Sparsest .] [L. sparsus, p. p. of spargere to strew, scatter. Cf. Asperse , Disperse .] Thinly scattered; set or planted here and there; not being dense or close together; as, a sparse population. --Carlyle. ...