Declension table of ?hetavya

Masculine	Singular	Dual	Plural
Nominative	hetavyaḥ	hetavyau	hetavyāḥ
Vocative	hetavya	hetavyau	hetavyāḥ
Accusative	hetavyam	hetavyau	hetavyān
Instrumental	hetavyena	hetavyābhyām	hetavyaiḥ hetavyebhiḥ
Dative	hetavyāya	hetavyābhyām	hetavyebhyaḥ
Ablative	hetavyāt	hetavyābhyām	hetavyebhyaḥ
Genitive	hetavyasya	hetavyayoḥ	hetavyānām
Locative	hetavye	hetavyayoḥ	hetavyeṣu

Compound hetavya -

Adverb -hetavyam -hetavyāt