Declension table of ?sāntvya

Masculine	Singular	Dual	Plural
Nominative	sāntvyaḥ	sāntvyau	sāntvyāḥ
Vocative	sāntvya	sāntvyau	sāntvyāḥ
Accusative	sāntvyam	sāntvyau	sāntvyān
Instrumental	sāntvyena	sāntvyābhyām	sāntvyaiḥ sāntvyebhiḥ
Dative	sāntvyāya	sāntvyābhyām	sāntvyebhyaḥ
Ablative	sāntvyāt	sāntvyābhyām	sāntvyebhyaḥ
Genitive	sāntvyasya	sāntvyayoḥ	sāntvyānām
Locative	sāntvye	sāntvyayoḥ	sāntvyeṣu

Compound sāntvya -

Adverb -sāntvyam -sāntvyāt