Declension table of ?sandhātavya

Neuter	Singular	Dual	Plural
Nominative	sandhātavyam	sandhātavye	sandhātavyāni
Vocative	sandhātavya	sandhātavye	sandhātavyāni
Accusative	sandhātavyam	sandhātavye	sandhātavyāni
Instrumental	sandhātavyena	sandhātavyābhyām	sandhātavyaiḥ
Dative	sandhātavyāya	sandhātavyābhyām	sandhātavyebhyaḥ
Ablative	sandhātavyāt	sandhātavyābhyām	sandhātavyebhyaḥ
Genitive	sandhātavyasya	sandhātavyayoḥ	sandhātavyānām
Locative	sandhātavye	sandhātavyayoḥ	sandhātavyeṣu

Compound sandhātavya -

Adverb -sandhātavyam -sandhātavyāt