Declension table of ?ketavya

Neuter	Singular	Dual	Plural
Nominative	ketavyam	ketavye	ketavyāni
Vocative	ketavya	ketavye	ketavyāni
Accusative	ketavyam	ketavye	ketavyāni
Instrumental	ketavyena	ketavyābhyām	ketavyaiḥ
Dative	ketavyāya	ketavyābhyām	ketavyebhyaḥ
Ablative	ketavyāt	ketavyābhyām	ketavyebhyaḥ
Genitive	ketavyasya	ketavyayoḥ	ketavyānām
Locative	ketavye	ketavyayoḥ	ketavyeṣu

Compound ketavya -

Adverb -ketavyam -ketavyāt