Declension table of ?saṅktavya

Neuter	Singular	Dual	Plural
Nominative	saṅktavyam	saṅktavye	saṅktavyāni
Vocative	saṅktavya	saṅktavye	saṅktavyāni
Accusative	saṅktavyam	saṅktavye	saṅktavyāni
Instrumental	saṅktavyena	saṅktavyābhyām	saṅktavyaiḥ
Dative	saṅktavyāya	saṅktavyābhyām	saṅktavyebhyaḥ
Ablative	saṅktavyāt	saṅktavyābhyām	saṅktavyebhyaḥ
Genitive	saṅktavyasya	saṅktavyayoḥ	saṅktavyānām
Locative	saṅktavye	saṅktavyayoḥ	saṅktavyeṣu

Compound saṅktavya -

Adverb -saṅktavyam -saṅktavyāt