Declension table of ?sumnya

Masculine	Singular	Dual	Plural
Nominative	sumnyaḥ	sumnyau	sumnyāḥ
Vocative	sumnya	sumnyau	sumnyāḥ
Accusative	sumnyam	sumnyau	sumnyān
Instrumental	sumnyena	sumnyābhyām	sumnyaiḥ sumnyebhiḥ
Dative	sumnyāya	sumnyābhyām	sumnyebhyaḥ
Ablative	sumnyāt	sumnyābhyām	sumnyebhyaḥ
Genitive	sumnyasya	sumnyayoḥ	sumnyānām
Locative	sumnye	sumnyayoḥ	sumnyeṣu

Compound sumnya -

Adverb -sumnyam -sumnyāt