Declension table of nirmamatva

Neuter	Singular	Dual	Plural
Nominative	nirmamatvam	nirmamatve	nirmamatvāni
Vocative	nirmamatva	nirmamatve	nirmamatvāni
Accusative	nirmamatvam	nirmamatve	nirmamatvāni
Instrumental	nirmamatvena	nirmamatvābhyām	nirmamatvaiḥ
Dative	nirmamatvāya	nirmamatvābhyām	nirmamatvebhyaḥ
Ablative	nirmamatvāt	nirmamatvābhyām	nirmamatvebhyaḥ
Genitive	nirmamatvasya	nirmamatvayoḥ	nirmamatvānām
Locative	nirmamatve	nirmamatvayoḥ	nirmamatveṣu

Compound nirmamatva -

Adverb -nirmamatvam -nirmamatvāt