Declension table of ?manasyu

Neuter	Singular	Dual	Plural
Nominative	manasyu	manasyunī	manasyūni
Vocative	manasyu	manasyunī	manasyūni
Accusative	manasyu	manasyunī	manasyūni
Instrumental	manasyunā	manasyubhyām	manasyubhiḥ
Dative	manasyune	manasyubhyām	manasyubhyaḥ
Ablative	manasyunaḥ	manasyubhyām	manasyubhyaḥ
Genitive	manasyunaḥ	manasyunoḥ	manasyūnām
Locative	manasyuni	manasyunoḥ	manasyuṣu

Compound manasyu -

Adverb -manasyu