Declension table of ?kṛṣṇayitavya

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇayitavyaḥ	kṛṣṇayitavyau	kṛṣṇayitavyāḥ
Vocative	kṛṣṇayitavya	kṛṣṇayitavyau	kṛṣṇayitavyāḥ
Accusative	kṛṣṇayitavyam	kṛṣṇayitavyau	kṛṣṇayitavyān
Instrumental	kṛṣṇayitavyena	kṛṣṇayitavyābhyām	kṛṣṇayitavyaiḥ kṛṣṇayitavyebhiḥ
Dative	kṛṣṇayitavyāya	kṛṣṇayitavyābhyām	kṛṣṇayitavyebhyaḥ
Ablative	kṛṣṇayitavyāt	kṛṣṇayitavyābhyām	kṛṣṇayitavyebhyaḥ
Genitive	kṛṣṇayitavyasya	kṛṣṇayitavyayoḥ	kṛṣṇayitavyānām
Locative	kṛṣṇayitavye	kṛṣṇayitavyayoḥ	kṛṣṇayitavyeṣu

Compound kṛṣṇayitavya -

Adverb -kṛṣṇayitavyam -kṛṣṇayitavyāt