1. At breakneck speed
   "they were travelling hell-for-leather"

See also: breakneck

• primero
• primeval
• primidone
• primigravida
• priming
• priming coat
• primipara
• primiparous
• unstated
• unstatesmanlike
• unsteadily
• unsteadiness
• unsteady
• unstep
• unsterilised
• unsterilized
• unstick
• unstilted
• unstimulated
• unstimulating
• unstinted
• unstinting
• unstintingly
• unstirred
• unstop