Declension table of ?nirdayatva

Neuter	Singular	Dual	Plural
Nominative	nirdayatvam	nirdayatve	nirdayatvāni
Vocative	nirdayatva	nirdayatve	nirdayatvāni
Accusative	nirdayatvam	nirdayatve	nirdayatvāni
Instrumental	nirdayatvena	nirdayatvābhyām	nirdayatvaiḥ
Dative	nirdayatvāya	nirdayatvābhyām	nirdayatvebhyaḥ
Ablative	nirdayatvāt	nirdayatvābhyām	nirdayatvebhyaḥ
Genitive	nirdayatvasya	nirdayatvayoḥ	nirdayatvānām
Locative	nirdayatve	nirdayatvayoḥ	nirdayatveṣu

Compound nirdayatva -

Adverb -nirdayatvam -nirdayatvāt