Declension table of ?dūrūḍhatva

Neuter	Singular	Dual	Plural
Nominative	dūrūḍhatvam	dūrūḍhatve	dūrūḍhatvāni
Vocative	dūrūḍhatva	dūrūḍhatve	dūrūḍhatvāni
Accusative	dūrūḍhatvam	dūrūḍhatve	dūrūḍhatvāni
Instrumental	dūrūḍhatvena	dūrūḍhatvābhyām	dūrūḍhatvaiḥ
Dative	dūrūḍhatvāya	dūrūḍhatvābhyām	dūrūḍhatvebhyaḥ
Ablative	dūrūḍhatvāt	dūrūḍhatvābhyām	dūrūḍhatvebhyaḥ
Genitive	dūrūḍhatvasya	dūrūḍhatvayoḥ	dūrūḍhatvānām
Locative	dūrūḍhatve	dūrūḍhatvayoḥ	dūrūḍhatveṣu

Compound dūrūḍhatva -

Adverb -dūrūḍhatvam -dūrūḍhatvāt