Declension table of ?kāravya

Neuter	Singular	Dual	Plural
Nominative	kāravyam	kāravye	kāravyāṇi
Vocative	kāravya	kāravye	kāravyāṇi
Accusative	kāravyam	kāravye	kāravyāṇi
Instrumental	kāravyeṇa	kāravyābhyām	kāravyaiḥ
Dative	kāravyāya	kāravyābhyām	kāravyebhyaḥ
Ablative	kāravyāt	kāravyābhyām	kāravyebhyaḥ
Genitive	kāravyasya	kāravyayoḥ	kāravyāṇām
Locative	kāravye	kāravyayoḥ	kāravyeṣu

Compound kāravya -

Adverb -kāravyam -kāravyāt