Declension table of ?śattavya

Masculine	Singular	Dual	Plural
Nominative	śattavyaḥ	śattavyau	śattavyāḥ
Vocative	śattavya	śattavyau	śattavyāḥ
Accusative	śattavyam	śattavyau	śattavyān
Instrumental	śattavyena	śattavyābhyām	śattavyaiḥ śattavyebhiḥ
Dative	śattavyāya	śattavyābhyām	śattavyebhyaḥ
Ablative	śattavyāt	śattavyābhyām	śattavyebhyaḥ
Genitive	śattavyasya	śattavyayoḥ	śattavyānām
Locative	śattavye	śattavyayoḥ	śattavyeṣu

Compound śattavya -

Adverb -śattavyam -śattavyāt