(p. 47) aparibartana absence or lack of change or alteration or modification; constancy; fixity; firmness. অপরিবর্তনীয় a. unchangeable, unalterable, immutable, invariable; unchanging; constant; fixed; firm. অপরিবর্তনীয়তা n. unchangeability, immutability; unchanging state; constancy; fixity; firmness. 9)

(p. 586) nirbikāra having no antipathy to anything; not offended by anything; unchanging, immutable; having no mental perturbation, unperturbed, unruffled, unmoved, not upset or agitated; indifferent, stoical, callous. ̃চিত্তে, নির্বিকারে adv. feeling no uneasiness in the mind; calmly. 7)