Declension table of ?vardhayitavya

Neuter	Singular	Dual	Plural
Nominative	vardhayitavyam	vardhayitavye	vardhayitavyāni
Vocative	vardhayitavya	vardhayitavye	vardhayitavyāni
Accusative	vardhayitavyam	vardhayitavye	vardhayitavyāni
Instrumental	vardhayitavyena	vardhayitavyābhyām	vardhayitavyaiḥ
Dative	vardhayitavyāya	vardhayitavyābhyām	vardhayitavyebhyaḥ
Ablative	vardhayitavyāt	vardhayitavyābhyām	vardhayitavyebhyaḥ
Genitive	vardhayitavyasya	vardhayitavyayoḥ	vardhayitavyānām
Locative	vardhayitavye	vardhayitavyayoḥ	vardhayitavyeṣu

Compound vardhayitavya -

Adverb -vardhayitavyam -vardhayitavyāt