Synonyms of flat out

Adverb

1. bluffly, bluntly, brusquely, flat out, roundly

usage: in a blunt direct manner; "he spoke bluntly"; "he stated his opinion flat-out"; "he was criticized roundly"

2. flat out, like blue murder

usage: at top speed; "he ran flat out to catch the bus"; "he was off down the road like blue murder"