Declension table of ?sumnin

Masculine	Singular	Dual	Plural
Nominative	sumnī	sumninau	sumninaḥ
Vocative	sumnin	sumninau	sumninaḥ
Accusative	sumninam	sumninau	sumninaḥ
Instrumental	sumninā	sumnibhyām	sumnibhiḥ
Dative	sumnine	sumnibhyām	sumnibhyaḥ
Ablative	sumninaḥ	sumnibhyām	sumnibhyaḥ
Genitive	sumninaḥ	sumninoḥ	sumninām
Locative	sumnini	sumninoḥ	sumniṣu

Compound sumni -

Adverb -sumni