Declension table of ?nihantavya

Neuter	Singular	Dual	Plural
Nominative	nihantavyam	nihantavye	nihantavyāni
Vocative	nihantavya	nihantavye	nihantavyāni
Accusative	nihantavyam	nihantavye	nihantavyāni
Instrumental	nihantavyena	nihantavyābhyām	nihantavyaiḥ
Dative	nihantavyāya	nihantavyābhyām	nihantavyebhyaḥ
Ablative	nihantavyāt	nihantavyābhyām	nihantavyebhyaḥ
Genitive	nihantavyasya	nihantavyayoḥ	nihantavyānām
Locative	nihantavye	nihantavyayoḥ	nihantavyeṣu

Compound nihantavya -

Adverb -nihantavyam -nihantavyāt