Declension table of ?dhvartavya

Neuter	Singular	Dual	Plural
Nominative	dhvartavyam	dhvartavye	dhvartavyāni
Vocative	dhvartavya	dhvartavye	dhvartavyāni
Accusative	dhvartavyam	dhvartavye	dhvartavyāni
Instrumental	dhvartavyena	dhvartavyābhyām	dhvartavyaiḥ
Dative	dhvartavyāya	dhvartavyābhyām	dhvartavyebhyaḥ
Ablative	dhvartavyāt	dhvartavyābhyām	dhvartavyebhyaḥ
Genitive	dhvartavyasya	dhvartavyayoḥ	dhvartavyānām
Locative	dhvartavye	dhvartavyayoḥ	dhvartavyeṣu

Compound dhvartavya -

Adverb -dhvartavyam -dhvartavyāt