Declension table of ?harṣavat

Masculine	Singular	Dual	Plural
Nominative	harṣavān	harṣavantau	harṣavantaḥ
Vocative	harṣavan	harṣavantau	harṣavantaḥ
Accusative	harṣavantam	harṣavantau	harṣavataḥ
Instrumental	harṣavatā	harṣavadbhyām	harṣavadbhiḥ
Dative	harṣavate	harṣavadbhyām	harṣavadbhyaḥ
Ablative	harṣavataḥ	harṣavadbhyām	harṣavadbhyaḥ
Genitive	harṣavataḥ	harṣavatoḥ	harṣavatām
Locative	harṣavati	harṣavatoḥ	harṣavatsu

Compound harṣavat -

Adverb -harṣavantam