Declension table of ?sattavya

Neuter	Singular	Dual	Plural
Nominative	sattavyam	sattavye	sattavyāni
Vocative	sattavya	sattavye	sattavyāni
Accusative	sattavyam	sattavye	sattavyāni
Instrumental	sattavyena	sattavyābhyām	sattavyaiḥ
Dative	sattavyāya	sattavyābhyām	sattavyebhyaḥ
Ablative	sattavyāt	sattavyābhyām	sattavyebhyaḥ
Genitive	sattavyasya	sattavyayoḥ	sattavyānām
Locative	sattavye	sattavyayoḥ	sattavyeṣu

Compound sattavya -

Adverb -sattavyam -sattavyāt