Declension table of ?roṣṭavya

Neuter	Singular	Dual	Plural
Nominative	roṣṭavyam	roṣṭavye	roṣṭavyāni
Vocative	roṣṭavya	roṣṭavye	roṣṭavyāni
Accusative	roṣṭavyam	roṣṭavye	roṣṭavyāni
Instrumental	roṣṭavyena	roṣṭavyābhyām	roṣṭavyaiḥ
Dative	roṣṭavyāya	roṣṭavyābhyām	roṣṭavyebhyaḥ
Ablative	roṣṭavyāt	roṣṭavyābhyām	roṣṭavyebhyaḥ
Genitive	roṣṭavyasya	roṣṭavyayoḥ	roṣṭavyānām
Locative	roṣṭavye	roṣṭavyayoḥ	roṣṭavyeṣu

Compound roṣṭavya -

Adverb -roṣṭavyam -roṣṭavyāt