(1)重要性または重点を欠いた
(2)濃くない
(3)実質または重要性の欠如
(4)not dense; "a thin beard"; "trees were sparse"
さらに詳しく
(1)住人の数が減った状況（または住人が全くいない）
(2)the condition of having reduced numbers of inhabitants (or no inhabitants at all)
