Declension table of ?nirāntra

Masculine	Singular	Dual	Plural
Nominative	nirāntraḥ	nirāntrau	nirāntrāḥ
Vocative	nirāntra	nirāntrau	nirāntrāḥ
Accusative	nirāntram	nirāntrau	nirāntrān
Instrumental	nirāntreṇa	nirāntrābhyām	nirāntraiḥ nirāntrebhiḥ
Dative	nirāntrāya	nirāntrābhyām	nirāntrebhyaḥ
Ablative	nirāntrāt	nirāntrābhyām	nirāntrebhyaḥ
Genitive	nirāntrasya	nirāntrayoḥ	nirāntrāṇām
Locative	nirāntre	nirāntrayoḥ	nirāntreṣu

Compound nirāntra -

Adverb -nirāntram -nirāntrāt