"hitherto" in the adverb sense
1. so far, thus far, up to now, hitherto, heretofore, as yet, yet, til now, until now
used in negative statement to describe a situation that has existed up to this point or up to the present time
"So far he hasn't called"
"the sun isn't up yet"
Source: WordNet® (An amazing lexical database of English)
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