Declension table of ?siddha

Neuter	Singular	Dual	Plural
Nominative	siddham	siddhe	siddhāni
Vocative	siddha	siddhe	siddhāni
Accusative	siddham	siddhe	siddhāni
Instrumental	siddhena	siddhābhyām	siddhaiḥ
Dative	siddhāya	siddhābhyām	siddhebhyaḥ
Ablative	siddhāt	siddhābhyām	siddhebhyaḥ
Genitive	siddhasya	siddhayoḥ	siddhānām
Locative	siddhe	siddhayoḥ	siddheṣu

Compound siddha -

Adverb -siddham -siddhāt