naisthiki
naiṣṭhikī — irrevocable;
SB 1.2.18
naiṣṭhikī — unflinching;
SB 4.22.20
naiṣṭhikī — fixed;
SB 4.22.26
naiṣṭhikī — without cessation;
SB 10.1.15