on the spot (adv.)

• aboard
• apace
• decisively
• directly
• expeditiously
• forthwith
• here
• hereabout
• hereabouts
• hereto
• hither
• immediately
• instantaneously
• instantly
• momentarily
• momently
• now
• nowadays
• passing
• promptly
• pronto
• quick
• quickly
• slap-bang
• slapdash
• smartly
• speedily
• straightaway
• straightway
• summarily
• swiftly
• today
• tonight