Declension table of ?karptavya

Neuter	Singular	Dual	Plural
Nominative	karptavyam	karptavye	karptavyāni
Vocative	karptavya	karptavye	karptavyāni
Accusative	karptavyam	karptavye	karptavyāni
Instrumental	karptavyena	karptavyābhyām	karptavyaiḥ
Dative	karptavyāya	karptavyābhyām	karptavyebhyaḥ
Ablative	karptavyāt	karptavyābhyām	karptavyebhyaḥ
Genitive	karptavyasya	karptavyayoḥ	karptavyānām
Locative	karptavye	karptavyayoḥ	karptavyeṣu

Compound karptavya -

Adverb -karptavyam -karptavyāt