Declension table of ?upamantrin

Masculine	Singular	Dual	Plural
Nominative	upamantrī	upamantriṇau	upamantriṇaḥ
Vocative	upamantrin	upamantriṇau	upamantriṇaḥ
Accusative	upamantriṇam	upamantriṇau	upamantriṇaḥ
Instrumental	upamantriṇā	upamantribhyām	upamantribhiḥ
Dative	upamantriṇe	upamantribhyām	upamantribhyaḥ
Ablative	upamantriṇaḥ	upamantribhyām	upamantribhyaḥ
Genitive	upamantriṇaḥ	upamantriṇoḥ	upamantriṇām
Locative	upamantriṇi	upamantriṇoḥ	upamantriṣu

Compound upamantri -

Adverb -upamantri