Declension table of ?kretavya

Neuter	Singular	Dual	Plural
Nominative	kretavyam	kretavye	kretavyāni
Vocative	kretavya	kretavye	kretavyāni
Accusative	kretavyam	kretavye	kretavyāni
Instrumental	kretavyena	kretavyābhyām	kretavyaiḥ
Dative	kretavyāya	kretavyābhyām	kretavyebhyaḥ
Ablative	kretavyāt	kretavyābhyām	kretavyebhyaḥ
Genitive	kretavyasya	kretavyayoḥ	kretavyānām
Locative	kretavye	kretavyayoḥ	kretavyeṣu

Compound kretavya -

Adverb -kretavyam -kretavyāt