Declension table of ?nirastra

Neuter	Singular	Dual	Plural
Nominative	nirastram	nirastre	nirastrāṇi
Vocative	nirastra	nirastre	nirastrāṇi
Accusative	nirastram	nirastre	nirastrāṇi
Instrumental	nirastreṇa	nirastrābhyām	nirastraiḥ
Dative	nirastrāya	nirastrābhyām	nirastrebhyaḥ
Ablative	nirastrāt	nirastrābhyām	nirastrebhyaḥ
Genitive	nirastrasya	nirastrayoḥ	nirastrāṇām
Locative	nirastre	nirastrayoḥ	nirastreṣu

Compound nirastra -

Adverb -nirastram -nirastrāt