Declension table of ?chettavya

Masculine	Singular	Dual	Plural
Nominative	chettavyaḥ	chettavyau	chettavyāḥ
Vocative	chettavya	chettavyau	chettavyāḥ
Accusative	chettavyam	chettavyau	chettavyān
Instrumental	chettavyena	chettavyābhyām	chettavyaiḥ chettavyebhiḥ
Dative	chettavyāya	chettavyābhyām	chettavyebhyaḥ
Ablative	chettavyāt	chettavyābhyām	chettavyebhyaḥ
Genitive	chettavyasya	chettavyayoḥ	chettavyānām
Locative	chettavye	chettavyayoḥ	chettavyeṣu

Compound chettavya -

Adverb -chettavyam -chettavyāt