Declension table of ?niyantavyatva

Neuter	Singular	Dual	Plural
Nominative	niyantavyatvam	niyantavyatve	niyantavyatvāni
Vocative	niyantavyatva	niyantavyatve	niyantavyatvāni
Accusative	niyantavyatvam	niyantavyatve	niyantavyatvāni
Instrumental	niyantavyatvena	niyantavyatvābhyām	niyantavyatvaiḥ
Dative	niyantavyatvāya	niyantavyatvābhyām	niyantavyatvebhyaḥ
Ablative	niyantavyatvāt	niyantavyatvābhyām	niyantavyatvebhyaḥ
Genitive	niyantavyatvasya	niyantavyatvayoḥ	niyantavyatvānām
Locative	niyantavyatve	niyantavyatvayoḥ	niyantavyatveṣu

Compound niyantavyatva -

Adverb -niyantavyatvam -niyantavyatvāt