Declension table of ?tathāvādin

Neuter	Singular	Dual	Plural
Nominative	tathāvādi	tathāvādinī	tathāvādīni
Vocative	tathāvādin tathāvādi	tathāvādinī	tathāvādīni
Accusative	tathāvādi	tathāvādinī	tathāvādīni
Instrumental	tathāvādinā	tathāvādibhyām	tathāvādibhiḥ
Dative	tathāvādine	tathāvādibhyām	tathāvādibhyaḥ
Ablative	tathāvādinaḥ	tathāvādibhyām	tathāvādibhyaḥ
Genitive	tathāvādinaḥ	tathāvādinoḥ	tathāvādinām
Locative	tathāvādini	tathāvādinoḥ	tathāvādiṣu

Compound tathāvādi -

Adverb -tathāvādi