Declension table of ?mahāpāpa

Neuter	Singular	Dual	Plural
Nominative	mahāpāpam	mahāpāpe	mahāpāpāni
Vocative	mahāpāpa	mahāpāpe	mahāpāpāni
Accusative	mahāpāpam	mahāpāpe	mahāpāpāni
Instrumental	mahāpāpena	mahāpāpābhyām	mahāpāpaiḥ
Dative	mahāpāpāya	mahāpāpābhyām	mahāpāpebhyaḥ
Ablative	mahāpāpāt	mahāpāpābhyām	mahāpāpebhyaḥ
Genitive	mahāpāpasya	mahāpāpayoḥ	mahāpāpānām
Locative	mahāpāpe	mahāpāpayoḥ	mahāpāpeṣu

Compound mahāpāpa -

Adverb -mahāpāpam -mahāpāpāt