flat-out

[ flat-out ]

/ ˈflætˈaʊt /

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.

Origin of flat-out

First recorded in 1925–30

The president came to believe Shamir misled him on the settlement issue, or flat-out lied to him.

The Inside Story of U.S. Meddling in Israel’s Elections |Aaron David Miller |December 4, 2014 |DAILY BEAST
His post-mortem that there is no red or blue America was tired and flat-out wrong.

Earth to DNC: Dyspeptic Dad Still Votes, Too |Lloyd Green |November 11, 2014 |DAILY BEAST
Old Don said flat-out that he took the girl for both him and his son.

The Ballad of Johnny France |Richard Ben Cramer |January 12, 2014 |DAILY BEAST
More vexing than the short-shrift mentions are the flat-out omissions.

John Sutherland‘s Enjoyable Little History of Literature |Malcolm Forbes |November 29, 2013 |DAILY BEAST

By the time I finished doing this it had become a flat-out race.

College Application Guru Turned Author Lacy Crawford on ‘Early Decision’ |Lizzie Crocker |August 24, 2013 |DAILY BEAST
He believed in the New Work, believed in it with every fiber of his being, but an undiverse portfolio was flat-out irresponsible.

Makers |Cory Doctorow
This caused some concern over his meager fuel supply since his plan called for some flat-out jetting later on.

Far from Home |J.A. Taylor