Declension table of ?japtavya

Neuter	Singular	Dual	Plural
Nominative	japtavyam	japtavye	japtavyāni
Vocative	japtavya	japtavye	japtavyāni
Accusative	japtavyam	japtavye	japtavyāni
Instrumental	japtavyena	japtavyābhyām	japtavyaiḥ
Dative	japtavyāya	japtavyābhyām	japtavyebhyaḥ
Ablative	japtavyāt	japtavyābhyām	japtavyebhyaḥ
Genitive	japtavyasya	japtavyayoḥ	japtavyānām
Locative	japtavye	japtavyayoḥ	japtavyeṣu

Compound japtavya -

Adverb -japtavyam -japtavyāt