Declension table of gantavya

Masculine	Singular	Dual	Plural
Nominative	gantavyaḥ	gantavyau	gantavyāḥ
Vocative	gantavya	gantavyau	gantavyāḥ
Accusative	gantavyam	gantavyau	gantavyān
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