Declension table of ?kopitavya

Neuter	Singular	Dual	Plural
Nominative	kopitavyam	kopitavye	kopitavyāni
Vocative	kopitavya	kopitavye	kopitavyāni
Accusative	kopitavyam	kopitavye	kopitavyāni
Instrumental	kopitavyena	kopitavyābhyām	kopitavyaiḥ
Dative	kopitavyāya	kopitavyābhyām	kopitavyebhyaḥ
Ablative	kopitavyāt	kopitavyābhyām	kopitavyebhyaḥ
Genitive	kopitavyasya	kopitavyayoḥ	kopitavyānām
Locative	kopitavye	kopitavyayoḥ	kopitavyeṣu

Compound kopitavya -

Adverb -kopitavyam -kopitavyāt