Declension table of ?ghastavya

Masculine	Singular	Dual	Plural
Nominative	ghastavyaḥ	ghastavyau	ghastavyāḥ
Vocative	ghastavya	ghastavyau	ghastavyāḥ
Accusative	ghastavyam	ghastavyau	ghastavyān
Instrumental	ghastavyena	ghastavyābhyām	ghastavyaiḥ ghastavyebhiḥ
Dative	ghastavyāya	ghastavyābhyām	ghastavyebhyaḥ
Ablative	ghastavyāt	ghastavyābhyām	ghastavyebhyaḥ
Genitive	ghastavyasya	ghastavyayoḥ	ghastavyānām
Locative	ghastavye	ghastavyayoḥ	ghastavyeṣu

Compound ghastavya -

Adverb -ghastavyam -ghastavyāt