Declension table of ?tasitavya

Neuter	Singular	Dual	Plural
Nominative	tasitavyam	tasitavye	tasitavyāni
Vocative	tasitavya	tasitavye	tasitavyāni
Accusative	tasitavyam	tasitavye	tasitavyāni
Instrumental	tasitavyena	tasitavyābhyām	tasitavyaiḥ
Dative	tasitavyāya	tasitavyābhyām	tasitavyebhyaḥ
Ablative	tasitavyāt	tasitavyābhyām	tasitavyebhyaḥ
Genitive	tasitavyasya	tasitavyayoḥ	tasitavyānām
Locative	tasitavye	tasitavyayoḥ	tasitavyeṣu

Compound tasitavya -

Adverb -tasitavyam -tasitavyāt