sparsity (n.)

• dearth
• exiguity
• fewness
• infrequency
• meagerness
• miserliness
• niggardliness
• paucity
• poverty
• rareness
• rarity
• scantiness
• scarceness
• scarcity
• slowness
• smallness
• sparseness
• stinginess
• stringency
• thinness
• tightness
• uncommonness
• uniqueness
• unusualness