1. Immediately
   "it was love at first sight"
   - at first glance

Encyclopedia: At first sight

• Donner Pass
• Donnian
• donnish
• donnybrook
• donor
• donor card
• donut
• doo-doo
• doo-wop
• doob
• doobie
• doobrie
• doobry
• doodad
• doodah
• doodia
• doodle
• doodlebug
• doodler
• doodly-squat
• doofer
• doofus
• doohickey
• doolally
• Doolittle