Declension table of ?siddhamānasa

Neuter	Singular	Dual	Plural
Nominative	siddhamānasam	siddhamānase	siddhamānasāni
Vocative	siddhamānasa	siddhamānase	siddhamānasāni
Accusative	siddhamānasam	siddhamānase	siddhamānasāni
Instrumental	siddhamānasena	siddhamānasābhyām	siddhamānasaiḥ
Dative	siddhamānasāya	siddhamānasābhyām	siddhamānasebhyaḥ
Ablative	siddhamānasāt	siddhamānasābhyām	siddhamānasebhyaḥ
Genitive	siddhamānasasya	siddhamānasayoḥ	siddhamānasānām
Locative	siddhamānase	siddhamānasayoḥ	siddhamānaseṣu

Compound siddhamānasa -

Adverb -siddhamānasam -siddhamānasāt