as_yet
1. [ adverb ] used in negative statement to describe a situation that has existed up to this point or up to the present time
Synonyms: yet so_far heretofore thus_far hitherto up_to_now until_now til_now
Examples:

"So far he hasn't called" "the sun isn't up yet"

Similar spelling:   asset
  ask_out
  asat
  aside
  ascot
  as_to