Declension table of ?vādayitavya

Neuter	Singular	Dual	Plural
Nominative	vādayitavyam	vādayitavye	vādayitavyāni
Vocative	vādayitavya	vādayitavye	vādayitavyāni
Accusative	vādayitavyam	vādayitavye	vādayitavyāni
Instrumental	vādayitavyena	vādayitavyābhyām	vādayitavyaiḥ
Dative	vādayitavyāya	vādayitavyābhyām	vādayitavyebhyaḥ
Ablative	vādayitavyāt	vādayitavyābhyām	vādayitavyebhyaḥ
Genitive	vādayitavyasya	vādayitavyayoḥ	vādayitavyānām
Locative	vādayitavye	vādayitavyayoḥ	vādayitavyeṣu

Compound vādayitavya -

Adverb -vādayitavyam -vādayitavyāt