adjective Informal.
moving or working at top speed or with maximum effort; all-out: a flat-out effort by all contestants.
downright; thoroughgoing: Many of the paintings were flat-out forgeries.


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Example sentences
Flat-out speed, for a long time the measure of a supercomputer's worth, may be
  going out of style.
He was a flat-out, knee-crawling thug with the morals of a weasel on speed.
Someone who tells you anything other than a flat-out no is probably willing to
  negotiate a bit.
Her approach had changed from a few hours earlier when she flat-out denied any
  kind of haunting.
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