Declension table of ?hṛdyatva

Neuter	Singular	Dual	Plural
Nominative	hṛdyatvam	hṛdyatve	hṛdyatvāni
Vocative	hṛdyatva	hṛdyatve	hṛdyatvāni
Accusative	hṛdyatvam	hṛdyatve	hṛdyatvāni
Instrumental	hṛdyatvena	hṛdyatvābhyām	hṛdyatvaiḥ
Dative	hṛdyatvāya	hṛdyatvābhyām	hṛdyatvebhyaḥ
Ablative	hṛdyatvāt	hṛdyatvābhyām	hṛdyatvebhyaḥ
Genitive	hṛdyatvasya	hṛdyatvayoḥ	hṛdyatvānām
Locative	hṛdyatve	hṛdyatvayoḥ	hṛdyatveṣu

Compound hṛdyatva -

Adverb -hṛdyatvam -hṛdyatvāt