at once (adv.)

• amain
• apace
• coincidentally
• concurrently
• conjointly
• cursorily
• decisively
• directly
• expeditiously
• feverishly
• forthwith
• furiously
• hastily
• helter-skelter
• hotfoot
• hurriedly
• immediately
• instantly
• jointly
• mutually
• now
• pell-mell
• promptly
• pronto
• quickly
• simultaneously
• slapdash
• smartly
• speedily
• straightaway
• straightway
• summarily
• superficially
• swiftly
• together