so-far

(r) 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
as yet, heretofore, hitherto, thus far, til now, until now, up to now, yet,
(r) to the degree or extent that
- insofar as it can be ascertained, the horse lung is comparable to that of man
- so far as it is reasonably practical he should practice restraint
insofar, in so far, to that degree, to that extent,
(r) used after a superlative
- this is the best so far
- the largest drug bust yet
yet,

as yet heretofore hitherto thus far til now until now up to now yet insofar in so far to that degree to that extent