Declension table of ?niṣkin

Masculine	Singular	Dual	Plural
Nominative	niṣkī	niṣkiṇau	niṣkiṇaḥ
Vocative	niṣkin	niṣkiṇau	niṣkiṇaḥ
Accusative	niṣkiṇam	niṣkiṇau	niṣkiṇaḥ
Instrumental	niṣkiṇā	niṣkibhyām	niṣkibhiḥ
Dative	niṣkiṇe	niṣkibhyām	niṣkibhyaḥ
Ablative	niṣkiṇaḥ	niṣkibhyām	niṣkibhyaḥ
Genitive	niṣkiṇaḥ	niṣkiṇoḥ	niṣkiṇām
Locative	niṣkiṇi	niṣkiṇoḥ	niṣkiṣu

Compound niṣki -

Adverb -niṣki