Declension table of prasanna

Neuter	Singular	Dual	Plural
Nominative	prasannam	prasanne	prasannāni
Vocative	prasanna	prasanne	prasannāni
Accusative	prasannam	prasanne	prasannāni
Instrumental	prasannena	prasannābhyām	prasannaiḥ
Dative	prasannāya	prasannābhyām	prasannebhyaḥ
Ablative	prasannāt	prasannābhyām	prasannebhyaḥ
Genitive	prasannasya	prasannayoḥ	prasannānām
Locative	prasanne	prasannayoḥ	prasanneṣu

Compound prasanna -

Adverb -prasannam -prasannāt