Declension table of ?mānasatva

Neuter	Singular	Dual	Plural
Nominative	mānasatvam	mānasatve	mānasatvāni
Vocative	mānasatva	mānasatve	mānasatvāni
Accusative	mānasatvam	mānasatve	mānasatvāni
Instrumental	mānasatvena	mānasatvābhyām	mānasatvaiḥ
Dative	mānasatvāya	mānasatvābhyām	mānasatvebhyaḥ
Ablative	mānasatvāt	mānasatvābhyām	mānasatvebhyaḥ
Genitive	mānasatvasya	mānasatvayoḥ	mānasatvānām
Locative	mānasatve	mānasatvayoḥ	mānasatveṣu

Compound mānasatva -

Adverb -mānasatvam -mānasatvāt