hitherto
adverb /ˌhɪðəˈtuː/
/ˌhɪðərˈtuː/
(formal)- until now; until the particular time you are talking about
- a hitherto unknown species of moth
- Her life hitherto had been devoid of adventure.
Oxford Collocations DictionaryHitherto is used with these adjectives:- impossible
- neglected
- unheard-of
- …