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
- …
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hitherto