Declension table of ?tvacitavya

Neuter	Singular	Dual	Plural
Nominative	tvacitavyam	tvacitavye	tvacitavyāni
Vocative	tvacitavya	tvacitavye	tvacitavyāni
Accusative	tvacitavyam	tvacitavye	tvacitavyāni
Instrumental	tvacitavyena	tvacitavyābhyām	tvacitavyaiḥ
Dative	tvacitavyāya	tvacitavyābhyām	tvacitavyebhyaḥ
Ablative	tvacitavyāt	tvacitavyābhyām	tvacitavyebhyaḥ
Genitive	tvacitavyasya	tvacitavyayoḥ	tvacitavyānām
Locative	tvacitavye	tvacitavyayoḥ	tvacitavyeṣu

Compound tvacitavya -

Adverb -tvacitavyam -tvacitavyāt