Declension table of akartavya

Masculine	Singular	Dual	Plural
Nominative	akartavyaḥ	akartavyau	akartavyāḥ
Vocative	akartavya	akartavyau	akartavyāḥ
Accusative	akartavyam	akartavyau	akartavyān
Instrumental	akartavyena	akartavyābhyām	akartavyaiḥ akartavyebhiḥ
Dative	akartavyāya	akartavyābhyām	akartavyebhyaḥ
Ablative	akartavyāt	akartavyābhyām	akartavyebhyaḥ
Genitive	akartavyasya	akartavyayoḥ	akartavyānām
Locative	akartavye	akartavyayoḥ	akartavyeṣu

Compound akartavya -

Adverb -akartavyam -akartavyāt