Declension table of ?sustheya

Neuter	Singular	Dual	Plural
Nominative	sustheyam	sustheye	sustheyāni
Vocative	sustheya	sustheye	sustheyāni
Accusative	sustheyam	sustheye	sustheyāni
Instrumental	sustheyena	sustheyābhyām	sustheyaiḥ
Dative	sustheyāya	sustheyābhyām	sustheyebhyaḥ
Ablative	sustheyāt	sustheyābhyām	sustheyebhyaḥ
Genitive	sustheyasya	sustheyayoḥ	sustheyānām
Locative	sustheye	sustheyayoḥ	sustheyeṣu

Compound sustheya -

Adverb -sustheyam -sustheyāt