Declension table of ?vandhyatva

Neuter	Singular	Dual	Plural
Nominative	vandhyatvam	vandhyatve	vandhyatvāni
Vocative	vandhyatva	vandhyatve	vandhyatvāni
Accusative	vandhyatvam	vandhyatve	vandhyatvāni
Instrumental	vandhyatvena	vandhyatvābhyām	vandhyatvaiḥ
Dative	vandhyatvāya	vandhyatvābhyām	vandhyatvebhyaḥ
Ablative	vandhyatvāt	vandhyatvābhyām	vandhyatvebhyaḥ
Genitive	vandhyatvasya	vandhyatvayoḥ	vandhyatvānām
Locative	vandhyatve	vandhyatvayoḥ	vandhyatveṣu

Compound vandhyatva -

Adverb -vandhyatvam -vandhyatvāt