so far

Definitions of so far
1

adv to the degree or extent that

so far as it is reasonably practical he should practice restraint”
Synonyms:
in so far, insofar, to that degree, to that extent

adv used after a superlative

“this is the best so far
Synonyms:
yet

adv 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”
Synonyms:
as yet, heretofore, hitherto, thus far, til now, until now, up to now, yet

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