Declension table of ?gardhitavya

Neuter	Singular	Dual	Plural
Nominative	gardhitavyam	gardhitavye	gardhitavyāni
Vocative	gardhitavya	gardhitavye	gardhitavyāni
Accusative	gardhitavyam	gardhitavye	gardhitavyāni
Instrumental	gardhitavyena	gardhitavyābhyām	gardhitavyaiḥ
Dative	gardhitavyāya	gardhitavyābhyām	gardhitavyebhyaḥ
Ablative	gardhitavyāt	gardhitavyābhyām	gardhitavyebhyaḥ
Genitive	gardhitavyasya	gardhitavyayoḥ	gardhitavyānām
Locative	gardhitavye	gardhitavyayoḥ	gardhitavyeṣu

Compound gardhitavya -

Adverb -gardhitavyam -gardhitavyāt