Declension table of ?vyarthaka

Neuter	Singular	Dual	Plural
Nominative	vyarthakam	vyarthake	vyarthakāni
Vocative	vyarthaka	vyarthake	vyarthakāni
Accusative	vyarthakam	vyarthake	vyarthakāni
Instrumental	vyarthakena	vyarthakābhyām	vyarthakaiḥ
Dative	vyarthakāya	vyarthakābhyām	vyarthakebhyaḥ
Ablative	vyarthakāt	vyarthakābhyām	vyarthakebhyaḥ
Genitive	vyarthakasya	vyarthakayoḥ	vyarthakānām
Locative	vyarthake	vyarthakayoḥ	vyarthakeṣu

Compound vyarthaka -

Adverb -vyarthakam -vyarthakāt