Declension table of ?rātavya

Neuter	Singular	Dual	Plural
Nominative	rātavyam	rātavye	rātavyāni
Vocative	rātavya	rātavye	rātavyāni
Accusative	rātavyam	rātavye	rātavyāni
Instrumental	rātavyena	rātavyābhyām	rātavyaiḥ
Dative	rātavyāya	rātavyābhyām	rātavyebhyaḥ
Ablative	rātavyāt	rātavyābhyām	rātavyebhyaḥ
Genitive	rātavyasya	rātavyayoḥ	rātavyānām
Locative	rātavye	rātavyayoḥ	rātavyeṣu

Compound rātavya -

Adverb -rātavyam -rātavyāt