Declension table of ?duvasana

Neuter	Singular	Dual	Plural
Nominative	duvasanam	duvasane	duvasanāni
Vocative	duvasana	duvasane	duvasanāni
Accusative	duvasanam	duvasane	duvasanāni
Instrumental	duvasanena	duvasanābhyām	duvasanaiḥ
Dative	duvasanāya	duvasanābhyām	duvasanebhyaḥ
Ablative	duvasanāt	duvasanābhyām	duvasanebhyaḥ
Genitive	duvasanasya	duvasanayoḥ	duvasanānām
Locative	duvasane	duvasanayoḥ	duvasaneṣu

Compound duvasana -

Adverb -duvasanam -duvasanāt