Declension table of ?sumānasa

Neuter	Singular	Dual	Plural
Nominative	sumānasam	sumānase	sumānasāni
Vocative	sumānasa	sumānase	sumānasāni
Accusative	sumānasam	sumānase	sumānasāni
Instrumental	sumānasena	sumānasābhyām	sumānasaiḥ
Dative	sumānasāya	sumānasābhyām	sumānasebhyaḥ
Ablative	sumānasāt	sumānasābhyām	sumānasebhyaḥ
Genitive	sumānasasya	sumānasayoḥ	sumānasānām
Locative	sumānase	sumānasayoḥ	sumānaseṣu

Compound sumānasa -

Adverb -sumānasam -sumānasāt