Declension table of ?vyarthatva

Neuter	Singular	Dual	Plural
Nominative	vyarthatvam	vyarthatve	vyarthatvāni
Vocative	vyarthatva	vyarthatve	vyarthatvāni
Accusative	vyarthatvam	vyarthatve	vyarthatvāni
Instrumental	vyarthatvena	vyarthatvābhyām	vyarthatvaiḥ
Dative	vyarthatvāya	vyarthatvābhyām	vyarthatvebhyaḥ
Ablative	vyarthatvāt	vyarthatvābhyām	vyarthatvebhyaḥ
Genitive	vyarthatvasya	vyarthatvayoḥ	vyarthatvānām
Locative	vyarthatve	vyarthatvayoḥ	vyarthatveṣu

Compound vyarthatva -

Adverb -vyarthatvam -vyarthatvāt