Declension table of ?śaptavya

Neuter	Singular	Dual	Plural
Nominative	śaptavyam	śaptavye	śaptavyāni
Vocative	śaptavya	śaptavye	śaptavyāni
Accusative	śaptavyam	śaptavye	śaptavyāni
Instrumental	śaptavyena	śaptavyābhyām	śaptavyaiḥ
Dative	śaptavyāya	śaptavyābhyām	śaptavyebhyaḥ
Ablative	śaptavyāt	śaptavyābhyām	śaptavyebhyaḥ
Genitive	śaptavyasya	śaptavyayoḥ	śaptavyānām
Locative	śaptavye	śaptavyayoḥ	śaptavyeṣu

Compound śaptavya -

Adverb -śaptavyam -śaptavyāt