Declension table of ?gātavya

Neuter	Singular	Dual	Plural
Nominative	gātavyam	gātavye	gātavyāni
Vocative	gātavya	gātavye	gātavyāni
Accusative	gātavyam	gātavye	gātavyāni
Instrumental	gātavyena	gātavyābhyām	gātavyaiḥ
Dative	gātavyāya	gātavyābhyām	gātavyebhyaḥ
Ablative	gātavyāt	gātavyābhyām	gātavyebhyaḥ
Genitive	gātavyasya	gātavyayoḥ	gātavyānām
Locative	gātavye	gātavyayoḥ	gātavyeṣu

Compound gātavya -

Adverb -gātavyam -gātavyāt