Declension table of ?siddhasādhyaka

Masculine	Singular	Dual	Plural
Nominative	siddhasādhyakaḥ	siddhasādhyakau	siddhasādhyakāḥ
Vocative	siddhasādhyaka	siddhasādhyakau	siddhasādhyakāḥ
Accusative	siddhasādhyakam	siddhasādhyakau	siddhasādhyakān
Instrumental	siddhasādhyakena	siddhasādhyakābhyām	siddhasādhyakaiḥ siddhasādhyakebhiḥ
Dative	siddhasādhyakāya	siddhasādhyakābhyām	siddhasādhyakebhyaḥ
Ablative	siddhasādhyakāt	siddhasādhyakābhyām	siddhasādhyakebhyaḥ
Genitive	siddhasādhyakasya	siddhasādhyakayoḥ	siddhasādhyakānām
Locative	siddhasādhyake	siddhasādhyakayoḥ	siddhasādhyakeṣu

Compound siddhasādhyaka -

Adverb -siddhasādhyakam -siddhasādhyakāt