Declension table of ?chātavya

Masculine	Singular	Dual	Plural
Nominative	chātavyaḥ	chātavyau	chātavyāḥ
Vocative	chātavya	chātavyau	chātavyāḥ
Accusative	chātavyam	chātavyau	chātavyān
Instrumental	chātavyena	chātavyābhyām	chātavyaiḥ chātavyebhiḥ
Dative	chātavyāya	chātavyābhyām	chātavyebhyaḥ
Ablative	chātavyāt	chātavyābhyām	chātavyebhyaḥ
Genitive	chātavyasya	chātavyayoḥ	chātavyānām
Locative	chātavye	chātavyayoḥ	chātavyeṣu

Compound chātavya -

Adverb -chātavyam -chātavyāt