Declension table of ?sumadhura

Neuter	Singular	Dual	Plural
Nominative	sumadhuram	sumadhure	sumadhurāṇi
Vocative	sumadhura	sumadhure	sumadhurāṇi
Accusative	sumadhuram	sumadhure	sumadhurāṇi
Instrumental	sumadhureṇa	sumadhurābhyām	sumadhuraiḥ
Dative	sumadhurāya	sumadhurābhyām	sumadhurebhyaḥ
Ablative	sumadhurāt	sumadhurābhyām	sumadhurebhyaḥ
Genitive	sumadhurasya	sumadhurayoḥ	sumadhurāṇām
Locative	sumadhure	sumadhurayoḥ	sumadhureṣu

Compound sumadhura -

Adverb -sumadhuram -sumadhurāt