Declension table of ?bhretavya

Neuter	Singular	Dual	Plural
Nominative	bhretavyam	bhretavye	bhretavyāni
Vocative	bhretavya	bhretavye	bhretavyāni
Accusative	bhretavyam	bhretavye	bhretavyāni
Instrumental	bhretavyena	bhretavyābhyām	bhretavyaiḥ
Dative	bhretavyāya	bhretavyābhyām	bhretavyebhyaḥ
Ablative	bhretavyāt	bhretavyābhyām	bhretavyebhyaḥ
Genitive	bhretavyasya	bhretavyayoḥ	bhretavyānām
Locative	bhretavye	bhretavyayoḥ	bhretavyeṣu

Compound bhretavya -

Adverb -bhretavyam -bhretavyāt