Declension table of ?arūpaka

Neuter	Singular	Dual	Plural
Nominative	arūpakam	arūpake	arūpakāṇi
Vocative	arūpaka	arūpake	arūpakāṇi
Accusative	arūpakam	arūpake	arūpakāṇi
Instrumental	arūpakeṇa	arūpakābhyām	arūpakaiḥ
Dative	arūpakāya	arūpakābhyām	arūpakebhyaḥ
Ablative	arūpakāt	arūpakābhyām	arūpakebhyaḥ
Genitive	arūpakasya	arūpakayoḥ	arūpakāṇām
Locative	arūpake	arūpakayoḥ	arūpakeṣu

Compound arūpaka -

Adverb -arūpakam -arūpakāt