Declension table of ?nityavyaya

Masculine	Singular	Dual	Plural
Nominative	nityavyayaḥ	nityavyayau	nityavyayāḥ
Vocative	nityavyaya	nityavyayau	nityavyayāḥ
Accusative	nityavyayam	nityavyayau	nityavyayān
Instrumental	nityavyayena	nityavyayābhyām	nityavyayaiḥ nityavyayebhiḥ
Dative	nityavyayāya	nityavyayābhyām	nityavyayebhyaḥ
Ablative	nityavyayāt	nityavyayābhyām	nityavyayebhyaḥ
Genitive	nityavyayasya	nityavyayayoḥ	nityavyayānām
Locative	nityavyaye	nityavyayayoḥ	nityavyayeṣu

Compound nityavyaya -

Adverb -nityavyayam -nityavyayāt