अव्यवस्थित ढंग से
His books were lined up unsystematically on the shelf./in most cases mortality statistics are unavailable, insufficient, or unsystematically kept.

क्रमहीनतः
His books were lined up unsystematically on the shelf./in most cases mortality statistics are unavailable, insufficient, or unsystematically kept.

अक्रमतः
His books were lined up unsystematically on the shelf./in most cases mortality statistics are unavailable, insufficient, or unsystematically kept.

अव्यवस्थिततः
His books were lined up unsystematically on the shelf./in most cases mortality statistics are unavailable, insufficient, or unsystematically kept.