Declension table of prasanna

Masculine	Singular	Dual	Plural
Nominative	prasannaḥ	prasannau	prasannāḥ
Vocative	prasanna	prasannau	prasannāḥ
Accusative	prasannam	prasannau	prasannān
Instrumental	prasannena	prasannābhyām	prasannaiḥ prasannebhiḥ
Dative	prasannāya	prasannābhyām	prasannebhyaḥ
Ablative	prasannāt	prasannābhyām	prasannebhyaḥ
Genitive	prasannasya	prasannayoḥ	prasannānām
Locative	prasanne	prasannayoḥ	prasanneṣu

Compound prasanna -

Adverb -prasannam -prasannāt