Declension table of ?śattavya

Neuter	Singular	Dual	Plural
Nominative	śattavyam	śattavye	śattavyāni
Vocative	śattavya	śattavye	śattavyāni
Accusative	śattavyam	śattavye	śattavyāni
Instrumental	śattavyena	śattavyābhyām	śattavyaiḥ
Dative	śattavyāya	śattavyābhyām	śattavyebhyaḥ
Ablative	śattavyāt	śattavyābhyām	śattavyebhyaḥ
Genitive	śattavyasya	śattavyayoḥ	śattavyānām
Locative	śattavye	śattavyayoḥ	śattavyeṣu

Compound śattavya -

Adverb -śattavyam -śattavyāt