Declension table of gantavya

Neuter	Singular	Dual	Plural
Nominative	gantavyam	gantavye	gantavyāni
Vocative	gantavya	gantavye	gantavyāni
Accusative	gantavyam	gantavye	gantavyāni
Instrumental	gantavyena	gantavyābhyām	gantavyaiḥ
Dative	gantavyāya	gantavyābhyām	gantavyebhyaḥ
Ablative	gantavyāt	gantavyābhyām	gantavyebhyaḥ
Genitive	gantavyasya	gantavyayoḥ	gantavyānām
Locative	gantavye	gantavyayoḥ	gantavyeṣu

Compound gantavya -

Adverb -gantavyam -gantavyāt