<formal> used to say that someone has not done something, or that something has not happened when you think it should already have been done or have happened.
1 I have yet to hear Ray's version of what happened.
2 The bank has yet to respond to our letter.
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Seven Deadly Sins:
Wealth without work,Pleasure without conscience,Science without humanity,Knowledge without character,Politics without principle,Commerce without morality,Worship without sacrifice.
One more literally deadly: Eat without hunger :)