Declension table of ?nikartavya

Neuter	Singular	Dual	Plural
Nominative	nikartavyam	nikartavye	nikartavyāni
Vocative	nikartavya	nikartavye	nikartavyāni
Accusative	nikartavyam	nikartavye	nikartavyāni
Instrumental	nikartavyena	nikartavyābhyām	nikartavyaiḥ
Dative	nikartavyāya	nikartavyābhyām	nikartavyebhyaḥ
Ablative	nikartavyāt	nikartavyābhyām	nikartavyebhyaḥ
Genitive	nikartavyasya	nikartavyayoḥ	nikartavyānām
Locative	nikartavye	nikartavyayoḥ	nikartavyeṣu

Compound nikartavya -

Adverb -nikartavyam -nikartavyāt