Declension table of ?āptavya

Neuter	Singular	Dual	Plural
Nominative	āptavyam	āptavye	āptavyāni
Vocative	āptavya	āptavye	āptavyāni
Accusative	āptavyam	āptavye	āptavyāni
Instrumental	āptavyena	āptavyābhyām	āptavyaiḥ
Dative	āptavyāya	āptavyābhyām	āptavyebhyaḥ
Ablative	āptavyāt	āptavyābhyām	āptavyebhyaḥ
Genitive	āptavyasya	āptavyayoḥ	āptavyānām
Locative	āptavye	āptavyayoḥ	āptavyeṣu

Compound āptavya -

Adverb -āptavyam -āptavyāt