Declension table of ?nigīrṇatva

Neuter	Singular	Dual	Plural
Nominative	nigīrṇatvam	nigīrṇatve	nigīrṇatvāni
Vocative	nigīrṇatva	nigīrṇatve	nigīrṇatvāni
Accusative	nigīrṇatvam	nigīrṇatve	nigīrṇatvāni
Instrumental	nigīrṇatvena	nigīrṇatvābhyām	nigīrṇatvaiḥ
Dative	nigīrṇatvāya	nigīrṇatvābhyām	nigīrṇatvebhyaḥ
Ablative	nigīrṇatvāt	nigīrṇatvābhyām	nigīrṇatvebhyaḥ
Genitive	nigīrṇatvasya	nigīrṇatvayoḥ	nigīrṇatvānām
Locative	nigīrṇatve	nigīrṇatvayoḥ	nigīrṇatveṣu

Compound nigīrṇatva -

Adverb -nigīrṇatvam -nigīrṇatvāt