Declension table of ?drātavya

Neuter	Singular	Dual	Plural
Nominative	drātavyam	drātavye	drātavyāni
Vocative	drātavya	drātavye	drātavyāni
Accusative	drātavyam	drātavye	drātavyāni
Instrumental	drātavyena	drātavyābhyām	drātavyaiḥ
Dative	drātavyāya	drātavyābhyām	drātavyebhyaḥ
Ablative	drātavyāt	drātavyābhyām	drātavyebhyaḥ
Genitive	drātavyasya	drātavyayoḥ	drātavyānām
Locative	drātavye	drātavyayoḥ	drātavyeṣu

Compound drātavya -

Adverb -drātavyam -drātavyāt