Declension table of ?karṇayitavya

Neuter	Singular	Dual	Plural
Nominative	karṇayitavyam	karṇayitavye	karṇayitavyāni
Vocative	karṇayitavya	karṇayitavye	karṇayitavyāni
Accusative	karṇayitavyam	karṇayitavye	karṇayitavyāni
Instrumental	karṇayitavyena	karṇayitavyābhyām	karṇayitavyaiḥ
Dative	karṇayitavyāya	karṇayitavyābhyām	karṇayitavyebhyaḥ
Ablative	karṇayitavyāt	karṇayitavyābhyām	karṇayitavyebhyaḥ
Genitive	karṇayitavyasya	karṇayitavyayoḥ	karṇayitavyānām
Locative	karṇayitavye	karṇayitavyayoḥ	karṇayitavyeṣu

Compound karṇayitavya -

Adverb -karṇayitavyam -karṇayitavyāt