Declension table of ?ṛṣṭavat

Masculine	Singular	Dual	Plural
Nominative	ṛṣṭavān	ṛṣṭavantau	ṛṣṭavantaḥ
Vocative	ṛṣṭavan	ṛṣṭavantau	ṛṣṭavantaḥ
Accusative	ṛṣṭavantam	ṛṣṭavantau	ṛṣṭavataḥ
Instrumental	ṛṣṭavatā	ṛṣṭavadbhyām	ṛṣṭavadbhiḥ
Dative	ṛṣṭavate	ṛṣṭavadbhyām	ṛṣṭavadbhyaḥ
Ablative	ṛṣṭavataḥ	ṛṣṭavadbhyām	ṛṣṭavadbhyaḥ
Genitive	ṛṣṭavataḥ	ṛṣṭavatoḥ	ṛṣṭavatām
Locative	ṛṣṭavati	ṛṣṭavatoḥ	ṛṣṭavatsu

Compound ṛṣṭavat -

Adverb -ṛṣṭavantam