Declension table of hantavya

Neuter	Singular	Dual	Plural
Nominative	hantavyam	hantavye	hantavyāni
Vocative	hantavya	hantavye	hantavyāni
Accusative	hantavyam	hantavye	hantavyāni
Instrumental	hantavyena	hantavyābhyām	hantavyaiḥ
Dative	hantavyāya	hantavyābhyām	hantavyebhyaḥ
Ablative	hantavyāt	hantavyābhyām	hantavyebhyaḥ
Genitive	hantavyasya	hantavyayoḥ	hantavyānām
Locative	hantavye	hantavyayoḥ	hantavyeṣu

Compound hantavya -

Adverb -hantavyam -hantavyāt