Declension table of ?sumadra

Masculine	Singular	Dual	Plural
Nominative	sumadraḥ	sumadrau	sumadrāḥ
Vocative	sumadra	sumadrau	sumadrāḥ
Accusative	sumadram	sumadrau	sumadrān
Instrumental	sumadreṇa	sumadrābhyām	sumadraiḥ sumadrebhiḥ
Dative	sumadrāya	sumadrābhyām	sumadrebhyaḥ
Ablative	sumadrāt	sumadrābhyām	sumadrebhyaḥ
Genitive	sumadrasya	sumadrayoḥ	sumadrāṇām
Locative	sumadre	sumadrayoḥ	sumadreṣu

Compound sumadra -

Adverb -sumadram -sumadrāt