Declension table of kathayitavya

Neuter	Singular	Dual	Plural
Nominative	kathayitavyam	kathayitavye	kathayitavyāni
Vocative	kathayitavya	kathayitavye	kathayitavyāni
Accusative	kathayitavyam	kathayitavye	kathayitavyāni
Instrumental	kathayitavyena	kathayitavyābhyām	kathayitavyaiḥ
Dative	kathayitavyāya	kathayitavyābhyām	kathayitavyebhyaḥ
Ablative	kathayitavyāt	kathayitavyābhyām	kathayitavyebhyaḥ
Genitive	kathayitavyasya	kathayitavyayoḥ	kathayitavyānām
Locative	kathayitavye	kathayitavyayoḥ	kathayitavyeṣu

Compound kathayitavya -

Adverb -kathayitavyam -kathayitavyāt