Declension table of ?kṛṣṇasundara

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇasundaraḥ	kṛṣṇasundarau	kṛṣṇasundarāḥ
Vocative	kṛṣṇasundara	kṛṣṇasundarau	kṛṣṇasundarāḥ
Accusative	kṛṣṇasundaram	kṛṣṇasundarau	kṛṣṇasundarān
Instrumental	kṛṣṇasundareṇa	kṛṣṇasundarābhyām	kṛṣṇasundaraiḥ kṛṣṇasundarebhiḥ
Dative	kṛṣṇasundarāya	kṛṣṇasundarābhyām	kṛṣṇasundarebhyaḥ
Ablative	kṛṣṇasundarāt	kṛṣṇasundarābhyām	kṛṣṇasundarebhyaḥ
Genitive	kṛṣṇasundarasya	kṛṣṇasundarayoḥ	kṛṣṇasundarāṇām
Locative	kṛṣṇasundare	kṛṣṇasundarayoḥ	kṛṣṇasundareṣu

Compound kṛṣṇasundara -

Adverb -kṛṣṇasundaram -kṛṣṇasundarāt