Declension table of ?siddha

Masculine	Singular	Dual	Plural
Nominative	siddhaḥ	siddhau	siddhāḥ
Vocative	siddha	siddhau	siddhāḥ
Accusative	siddham	siddhau	siddhān
Instrumental	siddhena	siddhābhyām	siddhaiḥ siddhebhiḥ
Dative	siddhāya	siddhābhyām	siddhebhyaḥ
Ablative	siddhāt	siddhābhyām	siddhebhyaḥ
Genitive	siddhasya	siddhayoḥ	siddhānām
Locative	siddhe	siddhayoḥ	siddheṣu

Compound siddha -

Adverb -siddham -siddhāt