Declension table of ?avyayatva

Neuter	Singular	Dual	Plural
Nominative	avyayatvam	avyayatve	avyayatvāni
Vocative	avyayatva	avyayatve	avyayatvāni
Accusative	avyayatvam	avyayatve	avyayatvāni
Instrumental	avyayatvena	avyayatvābhyām	avyayatvaiḥ
Dative	avyayatvāya	avyayatvābhyām	avyayatvebhyaḥ
Ablative	avyayatvāt	avyayatvābhyām	avyayatvebhyaḥ
Genitive	avyayatvasya	avyayatvayoḥ	avyayatvānām
Locative	avyayatve	avyayatvayoḥ	avyayatveṣu

Compound avyayatva -

Adverb -avyayatvam -avyayatvāt