Declension table of ?nirvaktavya

Neuter	Singular	Dual	Plural
Nominative	nirvaktavyam	nirvaktavye	nirvaktavyāni
Vocative	nirvaktavya	nirvaktavye	nirvaktavyāni
Accusative	nirvaktavyam	nirvaktavye	nirvaktavyāni
Instrumental	nirvaktavyena	nirvaktavyābhyām	nirvaktavyaiḥ
Dative	nirvaktavyāya	nirvaktavyābhyām	nirvaktavyebhyaḥ
Ablative	nirvaktavyāt	nirvaktavyābhyām	nirvaktavyebhyaḥ
Genitive	nirvaktavyasya	nirvaktavyayoḥ	nirvaktavyānām
Locative	nirvaktavye	nirvaktavyayoḥ	nirvaktavyeṣu

Compound nirvaktavya -

Adverb -nirvaktavyam -nirvaktavyāt