Declension table of ?maṅktavya

Neuter	Singular	Dual	Plural
Nominative	maṅktavyam	maṅktavye	maṅktavyāni
Vocative	maṅktavya	maṅktavye	maṅktavyāni
Accusative	maṅktavyam	maṅktavye	maṅktavyāni
Instrumental	maṅktavyena	maṅktavyābhyām	maṅktavyaiḥ
Dative	maṅktavyāya	maṅktavyābhyām	maṅktavyebhyaḥ
Ablative	maṅktavyāt	maṅktavyābhyām	maṅktavyebhyaḥ
Genitive	maṅktavyasya	maṅktavyayoḥ	maṅktavyānām
Locative	maṅktavye	maṅktavyayoḥ	maṅktavyeṣu

Compound maṅktavya -

Adverb -maṅktavyam -maṅktavyāt