Declension table of ?vyarthakatva

Neuter	Singular	Dual	Plural
Nominative	vyarthakatvam	vyarthakatve	vyarthakatvāni
Vocative	vyarthakatva	vyarthakatve	vyarthakatvāni
Accusative	vyarthakatvam	vyarthakatve	vyarthakatvāni
Instrumental	vyarthakatvena	vyarthakatvābhyām	vyarthakatvaiḥ
Dative	vyarthakatvāya	vyarthakatvābhyām	vyarthakatvebhyaḥ
Ablative	vyarthakatvāt	vyarthakatvābhyām	vyarthakatvebhyaḥ
Genitive	vyarthakatvasya	vyarthakatvayoḥ	vyarthakatvānām
Locative	vyarthakatve	vyarthakatvayoḥ	vyarthakatveṣu

Compound vyarthakatva -

Adverb -vyarthakatvam -vyarthakatvāt