Declension table of ?nirarthakatva

Neuter	Singular	Dual	Plural
Nominative	nirarthakatvam	nirarthakatve	nirarthakatvāni
Vocative	nirarthakatva	nirarthakatve	nirarthakatvāni
Accusative	nirarthakatvam	nirarthakatve	nirarthakatvāni
Instrumental	nirarthakatvena	nirarthakatvābhyām	nirarthakatvaiḥ
Dative	nirarthakatvāya	nirarthakatvābhyām	nirarthakatvebhyaḥ
Ablative	nirarthakatvāt	nirarthakatvābhyām	nirarthakatvebhyaḥ
Genitive	nirarthakatvasya	nirarthakatvayoḥ	nirarthakatvānām
Locative	nirarthakatve	nirarthakatvayoḥ	nirarthakatveṣu

Compound nirarthakatva -

Adverb -nirarthakatvam -nirarthakatvāt