Declension table of ?kṛṣṇāyitavya

Masculine	Singular	Dual	Plural
Nominative	kṛṣṇāyitavyaḥ	kṛṣṇāyitavyau	kṛṣṇāyitavyāḥ
Vocative	kṛṣṇāyitavya	kṛṣṇāyitavyau	kṛṣṇāyitavyāḥ
Accusative	kṛṣṇāyitavyam	kṛṣṇāyitavyau	kṛṣṇāyitavyān
Instrumental	kṛṣṇāyitavyena	kṛṣṇāyitavyābhyām	kṛṣṇāyitavyaiḥ kṛṣṇāyitavyebhiḥ
Dative	kṛṣṇāyitavyāya	kṛṣṇāyitavyābhyām	kṛṣṇāyitavyebhyaḥ
Ablative	kṛṣṇāyitavyāt	kṛṣṇāyitavyābhyām	kṛṣṇāyitavyebhyaḥ
Genitive	kṛṣṇāyitavyasya	kṛṣṇāyitavyayoḥ	kṛṣṇāyitavyānām
Locative	kṛṣṇāyitavye	kṛṣṇāyitavyayoḥ	kṛṣṇāyitavyeṣu

Compound kṛṣṇāyitavya -

Adverb -kṛṣṇāyitavyam -kṛṣṇāyitavyāt