Declension table of ?nidhyarthin

Neuter	Singular	Dual	Plural
Nominative	nidhyarthi	nidhyarthinī	nidhyarthīni
Vocative	nidhyarthin nidhyarthi	nidhyarthinī	nidhyarthīni
Accusative	nidhyarthi	nidhyarthinī	nidhyarthīni
Instrumental	nidhyarthinā	nidhyarthibhyām	nidhyarthibhiḥ
Dative	nidhyarthine	nidhyarthibhyām	nidhyarthibhyaḥ
Ablative	nidhyarthinaḥ	nidhyarthibhyām	nidhyarthibhyaḥ
Genitive	nidhyarthinaḥ	nidhyarthinoḥ	nidhyarthinām
Locative	nidhyarthini	nidhyarthinoḥ	nidhyarthiṣu

Compound nidhyarthi -

Adverb -nidhyarthi