Declension table of ?duvasana

Masculine	Singular	Dual	Plural
Nominative	duvasanaḥ	duvasanau	duvasanāḥ
Vocative	duvasana	duvasanau	duvasanāḥ
Accusative	duvasanam	duvasanau	duvasanān
Instrumental	duvasanena	duvasanābhyām	duvasanaiḥ duvasanebhiḥ
Dative	duvasanāya	duvasanābhyām	duvasanebhyaḥ
Ablative	duvasanāt	duvasanābhyām	duvasanebhyaḥ
Genitive	duvasanasya	duvasanayoḥ	duvasanānām
Locative	duvasane	duvasanayoḥ	duvasaneṣu

Compound duvasana -

Adverb -duvasanam -duvasanāt