Declension table of ?niṣphalatva

Neuter	Singular	Dual	Plural
Nominative	niṣphalatvam	niṣphalatve	niṣphalatvāni
Vocative	niṣphalatva	niṣphalatve	niṣphalatvāni
Accusative	niṣphalatvam	niṣphalatve	niṣphalatvāni
Instrumental	niṣphalatvena	niṣphalatvābhyām	niṣphalatvaiḥ
Dative	niṣphalatvāya	niṣphalatvābhyām	niṣphalatvebhyaḥ
Ablative	niṣphalatvāt	niṣphalatvābhyām	niṣphalatvebhyaḥ
Genitive	niṣphalatvasya	niṣphalatvayoḥ	niṣphalatvānām
Locative	niṣphalatve	niṣphalatvayoḥ	niṣphalatveṣu

Compound niṣphalatva -

Adverb -niṣphalatvam -niṣphalatvāt