Declension table of ?antastya

Neuter	Singular	Dual	Plural
Nominative	antastyam	antastye	antastyāni
Vocative	antastya	antastye	antastyāni
Accusative	antastyam	antastye	antastyāni
Instrumental	antastyena	antastyābhyām	antastyaiḥ
Dative	antastyāya	antastyābhyām	antastyebhyaḥ
Ablative	antastyāt	antastyābhyām	antastyebhyaḥ
Genitive	antastyasya	antastyayoḥ	antastyānām
Locative	antastye	antastyayoḥ	antastyeṣu

Compound antastya -

Adverb -antastyam -antastyāt