Declension table of ?vastayitavya

Neuter	Singular	Dual	Plural
Nominative	vastayitavyam	vastayitavye	vastayitavyāni
Vocative	vastayitavya	vastayitavye	vastayitavyāni
Accusative	vastayitavyam	vastayitavye	vastayitavyāni
Instrumental	vastayitavyena	vastayitavyābhyām	vastayitavyaiḥ
Dative	vastayitavyāya	vastayitavyābhyām	vastayitavyebhyaḥ
Ablative	vastayitavyāt	vastayitavyābhyām	vastayitavyebhyaḥ
Genitive	vastayitavyasya	vastayitavyayoḥ	vastayitavyānām
Locative	vastayitavye	vastayitavyayoḥ	vastayitavyeṣu

Compound vastayitavya -

Adverb -vastayitavyam -vastayitavyāt