Declension table of ?vijñātavya

Neuter	Singular	Dual	Plural
Nominative	vijñātavyam	vijñātavye	vijñātavyāni
Vocative	vijñātavya	vijñātavye	vijñātavyāni
Accusative	vijñātavyam	vijñātavye	vijñātavyāni
Instrumental	vijñātavyena	vijñātavyābhyām	vijñātavyaiḥ
Dative	vijñātavyāya	vijñātavyābhyām	vijñātavyebhyaḥ
Ablative	vijñātavyāt	vijñātavyābhyām	vijñātavyebhyaḥ
Genitive	vijñātavyasya	vijñātavyayoḥ	vijñātavyānām
Locative	vijñātavye	vijñātavyayoḥ	vijñātavyeṣu

Compound vijñātavya -

Adverb -vijñātavyam -vijñātavyāt