Declension table of ?hṛdayastha

Neuter	Singular	Dual	Plural
Nominative	hṛdayastham	hṛdayasthe	hṛdayasthāni
Vocative	hṛdayastha	hṛdayasthe	hṛdayasthāni
Accusative	hṛdayastham	hṛdayasthe	hṛdayasthāni
Instrumental	hṛdayasthena	hṛdayasthābhyām	hṛdayasthaiḥ
Dative	hṛdayasthāya	hṛdayasthābhyām	hṛdayasthebhyaḥ
Ablative	hṛdayasthāt	hṛdayasthābhyām	hṛdayasthebhyaḥ
Genitive	hṛdayasthasya	hṛdayasthayoḥ	hṛdayasthānām
Locative	hṛdayasthe	hṛdayasthayoḥ	hṛdayastheṣu

Compound hṛdayastha -

Adverb -hṛdayastham -hṛdayasthāt