in·di·vis·i·ble /ˌin-də-'vi-zə-bəl/ adj: consisting of one whole whose parts cannot be divided or treated individually
an indivisible obligation
in·di·vis·i·bil·i·ty /-ˌvi-zə-'bi-lə-tē/ n
in·di·vis·i·bly adv
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.