Declension table of ?kṛṣṇasū

Feminine	Singular	Dual	Plural
Nominative	kṛṣṇasūḥ	kṛṣṇasuvau	kṛṣṇasuvaḥ
Vocative	kṛṣṇasūḥ kṛṣṇasu	kṛṣṇasuvau	kṛṣṇasuvaḥ
Accusative	kṛṣṇasuvam	kṛṣṇasuvau	kṛṣṇasuvaḥ
Instrumental	kṛṣṇasuvā	kṛṣṇasūbhyām	kṛṣṇasūbhiḥ
Dative	kṛṣṇasuvai kṛṣṇasuve	kṛṣṇasūbhyām	kṛṣṇasūbhyaḥ
Ablative	kṛṣṇasuvāḥ kṛṣṇasuvaḥ	kṛṣṇasūbhyām	kṛṣṇasūbhyaḥ
Genitive	kṛṣṇasuvāḥ kṛṣṇasuvaḥ	kṛṣṇasuvoḥ	kṛṣṇasūnām kṛṣṇasuvām
Locative	kṛṣṇasuvi kṛṣṇasuvām	kṛṣṇasuvoḥ	kṛṣṇasūṣu

Compound kṛṣṇasū -

Adverb -kṛṣṇasu