Declension table of ?mahātmavat

Masculine	Singular	Dual	Plural
Nominative	mahātmavān	mahātmavantau	mahātmavantaḥ
Vocative	mahātmavan	mahātmavantau	mahātmavantaḥ
Accusative	mahātmavantam	mahātmavantau	mahātmavataḥ
Instrumental	mahātmavatā	mahātmavadbhyām	mahātmavadbhiḥ
Dative	mahātmavate	mahātmavadbhyām	mahātmavadbhyaḥ
Ablative	mahātmavataḥ	mahātmavadbhyām	mahātmavadbhyaḥ
Genitive	mahātmavataḥ	mahātmavatoḥ	mahātmavatām
Locative	mahātmavati	mahātmavatoḥ	mahātmavatsu

Compound mahātmavat -

Adverb -mahātmavantam