Declension table of ?hṛddrava

Masculine	Singular	Dual	Plural
Nominative	hṛddravaḥ	hṛddravau	hṛddravāḥ
Vocative	hṛddrava	hṛddravau	hṛddravāḥ
Accusative	hṛddravam	hṛddravau	hṛddravān
Instrumental	hṛddraveṇa	hṛddravābhyām	hṛddravaiḥ hṛddravebhiḥ
Dative	hṛddravāya	hṛddravābhyām	hṛddravebhyaḥ
Ablative	hṛddravāt	hṛddravābhyām	hṛddravebhyaḥ
Genitive	hṛddravasya	hṛddravayoḥ	hṛddravāṇām
Locative	hṛddrave	hṛddravayoḥ	hṛddraveṣu

Compound hṛddrava -

Adverb -hṛddravam -hṛddravāt