Declension table of ?gandhayitavya

Neuter	Singular	Dual	Plural
Nominative	gandhayitavyam	gandhayitavye	gandhayitavyāni
Vocative	gandhayitavya	gandhayitavye	gandhayitavyāni
Accusative	gandhayitavyam	gandhayitavye	gandhayitavyāni
Instrumental	gandhayitavyena	gandhayitavyābhyām	gandhayitavyaiḥ
Dative	gandhayitavyāya	gandhayitavyābhyām	gandhayitavyebhyaḥ
Ablative	gandhayitavyāt	gandhayitavyābhyām	gandhayitavyebhyaḥ
Genitive	gandhayitavyasya	gandhayitavyayoḥ	gandhayitavyānām
Locative	gandhayitavye	gandhayitavyayoḥ	gandhayitavyeṣu

Compound gandhayitavya -

Adverb -gandhayitavyam -gandhayitavyāt