Declension table of ?śaptavya

Masculine	Singular	Dual	Plural
Nominative	śaptavyaḥ	śaptavyau	śaptavyāḥ
Vocative	śaptavya	śaptavyau	śaptavyāḥ
Accusative	śaptavyam	śaptavyau	śaptavyān
Instrumental	śaptavyena	śaptavyābhyām	śaptavyaiḥ śaptavyebhiḥ
Dative	śaptavyāya	śaptavyābhyām	śaptavyebhyaḥ
Ablative	śaptavyāt	śaptavyābhyām	śaptavyebhyaḥ
Genitive	śaptavyasya	śaptavyayoḥ	śaptavyānām
Locative	śaptavye	śaptavyayoḥ	śaptavyeṣu

Compound śaptavya -

Adverb -śaptavyam -śaptavyāt